2.6.0 Alpha1 virtual files mode - no preview/thumbnails in explorer for locally available files

[lulle2007200]

No previews for images etc. in windows explorer for downloaded files in owncloud virtual files mode.

Expected behaviour

Explorer should display previews for downloaded files.

Actual behaviour

Explorer only displays preview for files i just uploaded (just dropped into the sync folder).

After refreshing explorer (F5, close and reopen etc.), previews for all files are gone.

No previews for any downloaded files.

Steps to reproduce

0. Enable virtual files mode
1. Drag'n'drop image in sync folder.
2. Preview will be displayed.
3. Refresh explorer.
4. Preview disappears.
5. No preview for any file downloaded file.

Server configuration

Operating system: Ubuntu 18.10

Web server: Apache 2

Database: MySql

PHP version: 7.2

ownCloud version: 10.1.1

Client configuration

Client version: 2.6.0 Alpha 1

Operating system: Windows 10 Pro Using Windows 10 1809 (Buildnumber 17763). I have a second machine running Windows 10 LTSC Build 17763, exact same behaviour.

OS language: DE

Qt version used by client package (Linux only, see also Settings dialog): -

Client package (From ownCloud or distro) (Linux only): -

Installation path of client: C:\program files (X86)

[michaelstingl]

What is the exact version / build of your Win 10 Pro?

[lulle2007200]

Using Windows 10 1809 (Buildnumber 17763). I have a second machine running Windows 10 LTSC Build 17763, exact same behaviour.

[ckamm]

Interesting. Maybe some metadata forwarding needs to be done on the placeholder files.

[guruz]

https://docs.microsoft.com/en-us/windows/desktop/shell/thumbnail-providers

[TheOneRing]

~~https://docs.microsoft.com/en-us/windows/win32/cfapi/build-a-cloud-file-sync-engine a cloud file thumbnail provider is missing. AFAIK it requires a msix or alternative Windows 10 installer.~~

[michaelstingl]

@lulle2007200 could you check again with the 2.7-beta2? https://download.owncloud.com/desktop/ownCloud/testing/2.7.0.1947-v270beta2/

[Warlock667]

Although I am not lulle2007200 I tried 2.7-beta2, because I have the same problem. In my case 2.7-beta2 did not help. Neither pictures that were uploaded before I upgraded to 2.7-beta2, nor pictures I uploaded after the upgrade have a thumbnail in Win10. The thumbmail can only be seen for a short time after copying into the folder before it is synced. Right after the sync there is no thumbnail anymore.

[lulle2007200]

i currently dont have an owncloud server set up, will test in the next couple of days.

[TheOneRing]

i currently dont have an owncloud server set up, will test in the next couple of days.

You can use https://demo.owncloud.com/login for testing.

[ParisGreen]

I tried fiddling with this one a little myself, and it seems like windows only shows thumbnails for files that you've manually opened, even if they're set to locally available.

[TheOneRing]

Hmmm for some reason its working here. @ParisGreen which version of windows is that and which client version? (Windows version can be found out by running winver)

[Warlock667]

Just installed Windowsupdates and suddenly it works in my case.

Windowsversion: 1909 (Build 18363.1082) OC Client Version: 2.7.0v27beta3 (build 1997)

Windowsupdates that were just installed are:

KB4576484 KB4574727

That's just awesome! :-)

[TheOneRing]

I was hoping that its not a ownCloud bug :D

[lulle2007200]

Just tried, seems to be working