Couldn't open any of my PDF files after updating Nextcloud to 21.0.2

Steps to reproduce

Open any PDF files

Expected behaviour

Open the PDF file.

Actual behaviour

Shows error: Missing PDF file, and then the URL of the file

Server configuration

Operating system: Fedora Server 33 Web server: Apache Database: PostgreSQL PHP version: 7.4.19 Nextcloud version: (see Nextcloud admin page) 21.0.2 Where did you install Nextcloud from: From official website, zip file.

List of activated apps:

Enabled:
  - accessibility: 1.7.0
  - activity: 2.14.3
  - admin_audit: 1.11.0
  - analytics: 3.5.0
  - announcementcenter: 5.0.0
  - appointments: 1.9.1
  - apporder: 0.12.0
  - calendar: 2.2.1
  - camerarawpreviews: 0.7.11
  - cloud_federation_api: 1.4.0
  - cms_pico: 1.0.15
  - comments: 1.11.0
  - contacts: 3.5.1
  - contactsinteraction: 1.2.0
  - dashboard: 7.1.0
  - dav: 1.17.1
  - deck: 1.4.2
  - duplicatefinder: 0.0.8
  - event_update_notification: 1.2.0
  - external: 3.8.1
  - extract: 1.3.1
  - federatedfilesharing: 1.11.0
  - federation: 1.11.0
  - files: 1.16.0
  - files_automatedtagging: 1.11.0
  - files_markdown: 2.3.3
  - files_mindmap: 0.0.24
  - files_pdfviewer: 2.1.0
  - files_rightclick: 1.0.0
  - files_sharing: 1.13.1
  - files_texteditor: 2.14.0
  - files_trackdownloads: 1.10.0
  - files_trashbin: 1.11.0
  - files_versions: 1.14.0
  - files_videoplayer: 1.10.0
  - firstrunwizard: 2.10.0
  - flow_notifications: 1.1.0
  - forms: 2.2.4
  - geoblocker: 0.4.6
  - groupfolders: 9.0.1
  - guests: 2.0.0
  - integration_github: 1.0.0
  - logreader: 2.6.0
  - lookup_server_connector: 1.9.0
  - maps: 0.1.8
  - music: 1.2.0
  - nextcloud_announcements: 1.10.0
  - notifications: 2.9.0
  - oauth2: 1.9.0
  - password_policy: 1.11.0
  - pdfannotate: 0.0.5
  - photos: 1.3.0
  - privacy: 1.5.0
  - provisioning_api: 1.11.0
  - quicknotes: 0.7.1
  - quota_warning: 1.10.0
  - rainloop: 7.1.2
  - recommendations: 1.0.0
  - registration: 1.2.1
  - serverinfo: 1.11.0
  - settings: 1.3.0
  - sharebymail: 1.11.0
  - spreed: 11.2.1
  - support: 1.4.0
  - survey_client: 1.9.0
  - systemtags: 1.11.0
  - tasks: 0.13.6
  - text: 3.2.0
  - theming: 1.12.0
  - theming_customcss: 1.8.0
  - twofactor_backupcodes: 1.10.0
  - updatenotification: 1.11.0
  - user_status: 1.1.1
  - viewer: 1.5.0
  - weather_status: 1.1.0
  - workflow_ocr: 1.21.0
  - workflow_script: 1.6.0
  - workflowengine: 2.3.0
Disabled:
  - encryption
  - files_external
  - user_ldap

Nextcloud configuration:

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "nextacso.com",
            "www.nextacso.com",
            "https:\/\/www.nextacso.com",
            "https:\/\/nextacso.com"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "21.0.2.1",
        "overwrite.cli.url": "https:\/\/nextacso.com\/",
        "htaccess.RewriteBase": "\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "filelocking.enabled": true,
        "skeletondirectory": "",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "allow_local_remote_servers": true,
        "default_phone_region": "ET",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "timeout": 0,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "app_install_overwrite": [
            "music",
            "pdfdraw",
            "dashboardcharts",
            "whiteboard"
        ],
        "maintenance": false,
        "loglevel": 2,
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    },
    "apps": {
        "accessibility": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.7.0"
        },
        "activity": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "2.14.3",
            "notify_notification_calendar": "1",
            "notify_notification_calendar_event": "1",
            "notify_notification_comments": "1",
            "notify_notification_deck_comment": "1",
            "notify_notification_deck_card_description": "1",
            "notify_notification_deck": "1",
            "notify_email_deck_card_description": "0",
            "notify_notification_group_settings": "1",
            "notify_notification_security": "1",
            "notify_notification_personal_settings": "0",
            "notify_notification_favorite": "0",
            "notify_email_favorite": "0",
            "notify_notification_file_changed": "0",
            "notify_email_file_changed": "0",
            "notify_notification_file_favorite_changed": "1",
            "notify_email_file_favorite_changed": "0",
            "notify_notification_announcementcenter": "0",
            "notify_email_announcementcenter": "1",
            "notify_email_deck": "1",
            "notify_email_comments": "0",
            "notify_email_deck_comment": "0",
            "notify_email_calendar": "0",
            "notify_notification_calendar_todo": "0",
            "notify_email_calendar_todo": "0",
            "notify_notification_file_downloaded": "0",
            "notify_email_file_downloaded": "0",
            "notify_notification_shared": "0",
            "notify_email_calendar_event": "1",
            "notify_email_shared": "0",
            "notify_notification_remote_share": "0",
            "notify_email_remote_share": "0",
            "notify_notification_public_links": "1",
            "notify_email_public_links": "0",
            "notify_email_spreed": "0",
            "notify_notification_systemtags": "0",
            "notify_email_systemtags": "0",
            "notify_setting_batchtime": "3600",
            "notify_setting_self": "0",
            "notify_setting_selfemail": "0",
            "notify_notification_spreed": "1",
            "notify_notification_analytics_dataset": "0",
            "notify_email_analytics_dataset": "0",
            "notify_notification_analytics_data": "0",
            "notify_email_analytics_data": "0",
            "notify_notification_forms_newshare": "1",
            "notify_email_forms_newshare": "0",
            "notify_notification_forms_newsubmission": "1",
            "notify_email_forms_newsubmission": "0"
        },
        "admin_audit": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "afterlogic": {
            "installed_version": "2.0.1",
            "types": "",
            "enabled": "no"
        },
        "analytics": {
            "types": "",
            "enabled": "yes",
            "installed_version": "3.5.0"
        },
        "announcementcenter": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "5.0.0",
            "admin_groups": "[\"Legal Service Team\",\"Announcing Group\",\"admin\"]"
        },
        "appointments": {
            "hk": "4001ab8cb408cb0195e37a505bd24aa7ed016932f39a0076989e01b0f8987e2c",
            "tiv": "1958a1439fd4799fcba8faa2e6352fbf",
            "types": "dav",
            "enabled": "yes",
            "new_backend": "4",
            "installed_version": "1.9.1"
        },
        "apporder": {
            "types": "",
            "enabled": "yes",
            "installed_version": "0.12.0"
        },
        "audioplayer": {
            "installed_version": "3.1.0",
            "types": "filesystem",
            "enabled": "no"
        },
        "backgroundjob": {
            "lastjob": "451"
        },
        "bruteforcesettings": {
            "types": "",
            "installed_version": "2.1.0",
            "enabled": "no"
        },
        "calendar": {
            "types": "",
            "enabled": "yes",
            "installed_version": "2.2.1"
        },
        "camerarawpreviews": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "0.7.11"
        },
        "circles": {
            "local_gskey": "vqfAVVsBITlmCWyRECMKlZYuRZVEyGe",
            "test_nc_base": "",
            "enabled": "no",
            "installed_version": "0.21.1",
            "types": "filesystem,dav"
        },
        "cloud_federation_api": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "1.4.0"
        },
        "cms_pico": {
            "types": "filesystem",
            "enabled": "yes",
            "limit_groups": "[\"Communication & Technology Directorate\",\"Human Resource Development & Management Directorate\",\"Higher Administrator\",\"Higher Administrator's Secretary\",\"Chief of Staff\",\"Planning, Budgeting & Change Directorate\",\"Change & Good Governance Team\",\"Research & Induction Directorate\",\"Strategic Partnership Team\",\"Volunteerism Empowerment & Fund Administration\",\"Women's, Children & Youth Affairs Team\"]",
            "system_templates": "{\"empty\":{\"name\":\"empty\",\"type\":1,\"compat\":true},\"sample_pico\":{\"name\":\"sample_pico\",\"type\":1,\"compat\":true}}",
            "themes_etag": "LTnqehBCVQ",
            "system_themes": "{\"default\":{\"name\":\"default\",\"type\":1,\"compat\":true}}",
            "plugins_etag": "vUkCgYf03F",
            "system_plugins": "{\"PicoDeprecated\":{\"name\":\"PicoDeprecated\",\"type\":1,\"compat\":true}}",
            "installed_version": "1.0.15"
        },
        "comments": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "contacts": {
            "installed_version": "3.5.1",
            "types": "dav",
            "enabled": "yes"
        },
        "contactsinteraction": {
            "types": "dav",
            "enabled": "yes",
            "installed_version": "1.2.0"
        },
        "core": {
            "vendor": "nextcloud",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "installedat": "1611747092.9776",
            "installed.bundles": "[\"CoreBundle\"]",
            "backgroundjobs_mode": "cron",
            "theming.variables": "7811f2ce59fd6008395c4d15cc3894cd",
            "lastupdatedat": "1621678392",
            "lastcron": "1621678549",
            "shareapi_exclude_groups": "no",
            "moveavatarsdone": "yes",
            "previewsCleanedUp": "1",
            "lastupdateResult": "[]",
            "updater.secret.created": "1621663526",
            "shareapi_default_permission_candelete": "no",
            "shareapi_default_permissions": "23",
            "oc.integritycheck.checker": "[]"
        },
        "cospend": {
            "enabled": "no",
            "installed_version": "1.3.0",
            "types": ""
        },
        "dashboard": {
            "types": "",
            "enabled": "yes",
            "installed_version": "7.1.0"
        },
        "dashboardcharts": {
            "installed_version": "0.1.3",
            "types": "",
            "cachebuster": "9",
            "enabled": "no"
        },
        "dav": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "1.17.1",
            "regeneratedBirthdayCalendarsForYearFix": "yes",
            "buildCalendarSearchIndex": "yes",
            "buildCalendarReminderIndex": "yes",
            "chunks_migrated": "1"
        },
        "deck": {
            "types": "dav",
            "installed_version": "1.4.2",
            "enabled": "yes"
        },
        "duplicatefinder": {
            "installed_version": "0.0.8",
            "types": "",
            "enabled": "yes"
        },
        "epubreader": {
            "installed_version": "1.4.6",
            "types": "",
            "enabled": "no"
        },
        "event_update_notification": {
            "installed_version": "1.2.0",
            "types": "logging,dav",
            "enabled": "yes"
        },
        "external": {
            "installed_version": "3.8.1",
            "types": "",
            "enabled": "yes",
            "max_site": "3",
            "sites": "***REMOVED SENSITIVE VALUE***"
        },
        "extract": {
            "installed_version": "1.3.1",
            "types": "",
            "enabled": "yes"
        },
        "federatedfilesharing": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "federation": {
            "types": "authentication",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "files": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "1.16.0",
            "cronjob_scan_files": "500",
            "default_quota": "1 GB"
        },
        "files_accesscontrol": {
            "installed_version": "1.11.0",
            "types": "filesystem",
            "enabled": "no"
        },
        "files_antivirus": {
            "installed_version": "3.1.2",
            "av_path": "\/usr\/bin\/clamscan",
            "types": "filesystem,dav",
            "enabled": "no"
        },
        "files_automatedtagging": {
            "types": "filesystem",
            "installed_version": "1.11.0",
            "enabled": "yes"
        },
        "files_downloadactivity": {
            "installed_version": "1.10.0",
            "types": "filesystem",
            "enabled": "no"
        },
        "files_fulltextsearch": {
            "installed_version": "21.0.1",
            "types": "filesystem",
            "enabled": "no"
        },
        "files_markdown": {
            "installed_version": "2.3.3",
            "types": "",
            "enabled": "yes"
        },
        "files_mindmap": {
            "installed_version": "0.0.24",
            "types": "",
            "enabled": "yes"
        },
        "files_pdfviewer": {
            "types": "",
            "installed_version": "2.1.0",
            "enabled": "yes"
        },
        "files_readmemd": {
            "installed_version": "1.2.0",
            "types": "filesystem",
            "enabled": "no",
            "show_asciidoc": "false",
            "show_html": "false",
            "show_title": "true",
            "yellow_back": "true",
            "auto_refresh": "false",
            "disable_workspace": "true",
            "fileslist_header": "[\"HEADER\"]",
            "fileslist_footer": "[\"README\"]"
        },
        "files_rightclick": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.0.0"
        },
        "files_sharing": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "1.13.1"
        },
        "files_texteditor": {
            "installed_version": "2.14.0",
            "types": "",
            "enabled": "yes"
        },
        "files_trackdownloads": {
            "installed_version": "1.10.0",
            "types": "filesystem",
            "enabled": "yes"
        },
        "files_trashbin": {
            "types": "filesystem,dav",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "files_versions": {
            "types": "filesystem,dav",
            "enabled": "yes",
            "installed_version": "1.14.0"
        },
        "files_videoplayer": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.10.0"
        },
        "firstrunwizard": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "2.10.0"
        },
        "flow_notifications": {
            "installed_version": "1.1.0",
            "types": "",
            "enabled": "yes"
        },
        "forms": {
            "installed_version": "2.2.4",
            "types": "",
            "enabled": "yes"
        },
        "fulltextsearch_elasticsearch": {
            "installed_version": "21.0.0",
            "types": "",
            "enabled": "no"
        },
        "geoblocker": {
            "types": "",
            "enabled": "yes",
            "installed_version": "0.4.6",
            "chosenService": "3",
            "choosenCountries": "FI, ",
            "logWithIpAddress": "1",
            "logWithCountryCode": "1",
            "choosenWhiteBlackList": "0"
        },
        "gpxpod": {
            "resetPics404": "1",
            "installed_version": "4.2.8",
            "types": "",
            "reset304": "1",
            "enabled": "no"
        },
        "groupfolders": {
            "types": "filesystem,dav",
            "installed_version": "9.0.1",
            "enabled": "yes"
        },
        "guests": {
            "types": "authentication",
            "enabled": "yes",
            "installed_version": "2.0.0"
        },
        "integration_github": {
            "enabled": "[\"IT Team\"]",
            "installed_version": "1.0.0",
            "types": ""
        },
        "logreader": {
            "types": "",
            "enabled": "yes",
            "installed_version": "2.6.0",
            "relativedates": "1"
        },
        "lookup_server_connector": {
            "types": "authentication",
            "enabled": "yes",
            "installed_version": "1.9.0"
        },
        "mail": {
            "installed_version": "1.9.4",
            "types": "",
            "enabled": "no"
        },
        "maps": {
            "installed_version": "0.1.8",
            "types": "filesystem",
            "enabled": "yes",
            "lastAddressLookup": "1617362274",
            "osrmDEMO": "on"
        },
        "metadata": {
            "installed_version": "0.13.0",
            "types": "",
            "enabled": "no"
        },
        "music": {
            "types": "filesystem",
            "installed_version": "1.2.0",
            "enabled": "yes"
        },
        "nextcloud_announcements": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "1.10.0",
            "pub_date": "Thu, 24 Oct 2019 00:00:00 +0200",
            "notification_groups": "[\"admin\"]"
        },
        "notifications": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "2.9.0"
        },
        "oauth2": {
            "types": "authentication",
            "enabled": "yes",
            "installed_version": "1.9.0"
        },
        "onlyoffice": {
            "demo": "{\"available\":true,\"enabled\":true,\"start\":{\"date\":\"2021-04-15 13:54:18.627734\",\"timezone_type\":3,\"timezone\":\"UTC\"}}",
            "settings_error": "Error occurred in the document service: Error while downloading the document file to be converted.",
            "installed_version": "6.3.0",
            "types": "filesystem",
            "verify_peer_off": "true",
            "DocumentServerInternalUrl": "",
            "jwt_secret": "",
            "StorageUrl": "",
            "DocumentServerUrl": "https:\/\/192.168.15.23\/",
            "enabled": "no"
        },
        "password_policy": {
            "types": "authentication",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "pdfannotate": {
            "installed_version": "0.0.5",
            "types": "",
            "enabled": "yes",
            "download-token": "f4bCALKjxegdAf05yYc5ZaJ8uNDcu5t2"
        },
        "pdfdraw": {
            "installed_version": "0.1.2",
            "types": "",
            "enabled": "no",
            "backend": "{\"server\":\"192.168.15.23:8080\",\"secret\":\"1NOturningback\"}",
            "download-token": "Bzzp6ZvhIwESPgbGNxgb4eHKLhTtUOsu"
        },
        "photos": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.3.0"
        },
        "polls": {
            "installed_version": "1.8.3",
            "types": "",
            "enabled": "no"
        },
        "privacy": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.5.0"
        },
        "provisioning_api": {
            "types": "prevent_group_restriction",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "quicknotes": {
            "installed_version": "0.7.1",
            "types": "",
            "enabled": "yes"
        },
        "quota_warning": {
            "types": "filesystem",
            "installed_version": "1.10.0",
            "enabled": "yes",
            "warning_email": "no",
            "alert_email": "yes"
        },
        "rainloop": {
            "rainloop-autologin": "1",
            "enabled": "yes",
            "installed_version": "7.1.2",
            "types": "",
            "rainloop-autologin-with-email": ""
        },
        "recommendations": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.0.0"
        },
        "registration": {
            "installed_version": "1.2.1",
            "types": "prevent_group_restriction",
            "enabled": "yes",
            "admin_approval_required": "no",
            "email_is_login": "no",
            "domains_is_blocklist": "no",
            "show_domains": "no",
            "disable_email_verification": "no",
            "registered_user_group": "Guest User"
        },
        "richdocuments": {
            "installed_version": "3.7.13",
            "types": "filesystem,dav,prevent_group_restriction",
            "enabled": "no",
            "wopi_url": "https:\/\/nextacso.com\/apps\/richdocumentscode\/proxy.php?req=",
            "disable_certificate_verification": "yes"
        },
        "richdocumentscode": {
            "enabled": "no",
            "installed_version": "6.4.303",
            "types": ""
        },
        "serverinfo": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "settings": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.3.0"
        },
        "sharebymail": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "sharepermissions": {
            "installed_version": "1.0.1",
            "types": "filesystem",
            "enabled": "no"
        },
        "spreed": {
            "has_reference_id": "yes",
            "stun_servers": "***REMOVED SENSITIVE VALUE***",
            "types": "dav,prevent_group_restriction",
            "enabled": "yes",
            "installed_version": "11.2.1",
            "signaling_ticket_secret": "***REMOVED SENSITIVE VALUE***",
            "project_access_invalidated": "1"
        },
        "support": {
            "types": "session",
            "enabled": "yes",
            "installed_version": "1.4.0",
            "SwitchUpdaterServerHasRun": "yes"
        },
        "survey_client": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.9.0",
            "last_sent": "1617183155",
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        },
        "systemtags": {
            "types": "logging",
            "enabled": "yes",
            "installed_version": "1.11.0"
        },
        "tasks": {
            "installed_version": "0.13.6",
            "types": "",
            "enabled": "yes"
        },
        "terms_of_service": {
            "installed_version": "1.6.1",
            "types": "filesystem",
            "enabled": "no"
        },
        "text": {
            "types": "dav",
            "enabled": "yes",
            "installed_version": "3.2.0"
        },
        "theming": {
            "types": "logging",
            "enabled": "yes",
            "backgroundMime": "image\/jpeg",
            "installed_version": "1.12.0",
            "slogan": "***REMOVED SENSITIVE VALUE***",
            "logoMime": "image\/png",
            "cachebuster": "8",
            "name": "Nextcloud @ ACSO"
        },
        "theming_customcss": {
            "installed_version": "1.8.0",
            "types": "",
            "enabled": "yes"
        },
        "timemanager": {
            "installed_version": "0.1.6",
            "types": "",
            "enabled": "no"
        },
        "timetracker": {
            "types": "",
            "enabled": "no",
            "installed_version": "0.0.53"
        },
        "twofactor_backupcodes": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.10.0"
        },
        "updatenotification": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.11.0",
            "core": "21.0.2.1",
            "update_check_errors": "0",
            "geoblocker": "0.4.6",
            "extract": "1.3.1",
            "spreed": "11.2.1",
            "apporder": "0.12.0",
            "rainloop": "7.1.1",
            "analytics": "3.4.1",
            "contacts": "3.5.1",
            "quicknotes": "0.6.7",
            "forms": "2.2.4",
            "cms_pico": "1.0.15",
            "duplicatefinder": "0.0.8",
            "music": "1.2.0",
            "appointments": "1.9.0",
            "deck": "1.4.2",
            "registration": "1.2.1",
            "calendar": "2.2.1",
            "camerarawpreviews": "0.7.11"
        },
        "user_status": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.1.1"
        },
        "viewer": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.5.0"
        },
        "weather_status": {
            "types": "",
            "enabled": "yes",
            "installed_version": "1.1.0"
        },
        "whiteboard": {
            "installed_version": "0.0.3",
            "types": "",
            "enabled": "no"
        },
        "workflow_ocr": {
            "installed_version": "1.21.0",
            "types": "filesystem",
            "enabled": "yes"
        },
        "workflow_pdf_converter": {
            "installed_version": "1.6.0",
            "types": "filesystem",
            "enabled": "no"
        },
        "workflow_script": {
            "installed_version": "1.6.0",
            "types": "filesystem",
            "enabled": "yes"
        },
        "workflowengine": {
            "types": "filesystem",
            "enabled": "yes",
            "installed_version": "2.3.0"
        }
    }
}

Client configuration

Browser: Microsoft Edge Operating system: Windows 10

Logs

Failed to load resource: the server responded with a status of 404 () l10n.js:825 #missing_file_error is undefined. l10n.js:825 #error_version_info is undefined. l10n.js:825 #error_message is undefined. nextacso.com/:1 Uncaught (in promise) MissingPDFException message: "Missing PDF \"https://nextacso.com/remote.php/dav/files/administrator/Nextcloud%2520Manual.pdf\"." name: "MissingPDFException" proto: Error

Nextcloud log (data/owncloud.log)

Checked the log, and there is no new log since 3 days, and I updated today Nextcloud today.

Browser log

Insert your browser log here, this could for example include:
Failed to load resource: the server responded with a status of 404 ()
l10n.js:825 #missing_file_error is undefined.
l10n.js:825 #error_version_info is undefined.
l10n.js:825 #error_message is undefined.
nextacso.com/:1 Uncaught (in promise) 
MissingPDFException
message: "Missing PDF \"https://nextacso.com/remote.php/dav/files/administrator/Nextcloud%2520Manual.pdf\"."
name: "MissingPDFException"
__proto__: Error

nextcloud / files_pdfviewer