Unable to Upload PDFs in LangFlow Playground

jeremiah-louis commented 3 months ago

Description: I am currently working on a project that involves uploading and processing PDF files using LangFlow Playground. However, I have encountered an issue where the system does not allow me to upload PDF files. This functionality is crucial for my project's requirements.

Steps to Reproduce:

Go to LangFlow Playground. Attempt to upload a PDF file using the provided upload feature. Observe the behavior and the error message (if any).

Expected Behavior: The PDF file should be successfully uploaded and processed by LangFlow Playground.

Actual Behavior: The system does not allow the upload of PDF files. System provides the following error;

Log: Error uploading file Please ensure your file has one of the following extensions: png, jpg, jpeg

Environment: Operating System: Mac OS Browser: Arc Browser LangFlow Version: Langflow version 1.0

Additional Context: This issue is blocking the progress of my project, which involves a Retrieval-Augmented Generation (RAG) system that ingests PDF files to generate tailored responses. Your prompt assistance in resolving this issue would be greatly appreciated.

dosubot[bot] commented 3 months ago

Hey @jjboy55! I'm here to help you with bugs, questions, and becoming a contributor. Let's tackle this issue together!

To resolve the issue where LangFlow Playground does not allow the upload of PDF files and provides an error message that only certain image file types are supported, you need to ensure that the file input configuration includes support for PDF files. The PyPDFLoader template is configured to accept .pdf file types.

Here is the relevant configuration snippet for PyPDFLoader:

{
  "PyPDFLoader": {
    "template": {
      "file_path": {
        "type": "file",
        "required": true,
        "placeholder": "",
        "list": false,
        "show": true,
        "multiline": false,
        "value": "",
        "fileTypes": [".pdf"],
        "file_path": "",
        "password": false,
        "name": "file_path",
        "advanced": false,
        "dynamic": false,
        "info": "",
        "title_case": false
      },
      "metadata": {
        "type": "dict",
        "required": false,
        "placeholder": "",
        "list": false,
        "show": true,
        "multiline": false,
        "value": {},
        "fileTypes": [],
        "file_path": "",
        "password": false,
        "name": "metadata",
        "display_name": "Metadata",
        "advanced": false,
        "dynamic": false,
        "info": "",
        "title_case": false
      },
      "_type": "PyPDFLoader"
    },
    "description": "Load PDF using pypdf into list of documents.",
    "base_classes": ["Document"],
    "display_name": "PyPDFLoader",
    "documentation": "https://python.langchain.com/docs/modules/data_connection/document_loaders/how_to/pdf",
    "custom_fields": {},
    "output_types": ["Document"],
    "field_formatters": {},
    "pinned": false,
    "beta": false
  }
}

Additionally, ensure that the LOADERS_INFO configuration in constants.py includes the PyPDFLoader with the allowed file type .pdf:

LOADERS_INFO: List[Dict[str, Any]] = [
    {
        "loader": "PyPDFLoader",
        "name": "PyPDF (.pdf)",
        "import": "langchain_community.document_loaders.PyPDFLoader",
        "defaultFor": ["pdf"],
        "allowdTypes": ["pdf"],
    },
    // other loaders...
]

Ensure that this configuration is correctly implemented in your LangFlow setup. This should allow the upload of PDF files without encountering the error message ^[1]^[2].

Additionally, LangFlow provides specific error logs and debugging tools that can help identify why a PDF upload is failing. The relevant error messages include:

UPLOAD_ERROR_ALERT: "Error uploading file"
WRONG_FILE_ERROR_ALERT: "Invalid file type"
CONSOLE_ERROR_MSG: "Error occurred while uploading file"

LangFlow uses the loguru library for logging, configured to provide detailed logs. The logs are stored in a file named langflow.log located in the user cache directory. These logs can be very useful for debugging issues related to file uploads in LangFlow ^[3]^[4].

To continue talking to Dosu, mention @dosu.

carlosrcoelho commented 3 months ago

Hey @jjboy55

To use a PDF, you can use the File component located in the Data tab on the sidebar.