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Power Platform Community / Forums / Power Pages - Customize & Extend / Generate Thumbnail for...
Power Pages - Customize & Extend
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Generate Thumbnail for large files

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Posted on by CU24071054-0
Hi Team,

I have developed a custom coding power page, where i have used Dropzone using JS libraries. Where i am uploading multiple files which are .jpeg/.png/.avi/.psd/.psb/.tiff at a time and able to submit to sharepoint library using Chunk model.

I am generating thumbnails using Graph api at runtime once the files are uploaded to sharepoint successfully.  The issue i am facing is, i can't generate the thumbnails which are greater than 250MB. Why because Graph cant generate thumbnails >250MB files.

Can anyone suggest me a way to generate thumbnails for large files(1GB/3GB .psd/.psb)?

I know using power automate we can generate thumbnails by using connector computer vision api connector, action Generate Thumbnail.
But, due to DLP restrictions i can't use it in PowerAutomate. I will try to check to check with admin team on that and verify.

Thanks in Advance.
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  • Suggested answer
    Jon Unzueta Profile Picture
    Jon Unzueta 759 on at
    Generate Thumbnail for large files
     

    You're correct that Microsoft Graph API has a 250MB limit for generating thumbnails, which poses a challenge for large files like high-resolution PSD/PSB formats. Since Power Automate is restricted due to DLP policies, here are some alternative approaches you can consider:

    Alternative Solutions for Generating Thumbnails for Large Files

    1. Use a Local or Server-Side Image Processing Tool

    You can set up a backend service (e.g., using Node.js, Python, or .NET) that:

    • Downloads the large file from SharePoint.
    • Uses a library like:
      • ImageMagick or GraphicsMagick (for PSD/PSB support)
      • Python PIL/Pillow (for basic image formats)
      • PSD.js (for parsing PSD files in Node.js)
    • Generates a thumbnail (e.g., 300x300px JPEG).
    • Uploads the thumbnail back to SharePoint or stores it in a separate location.

    This avoids the Graph API limitation entirely.

    2. Use Desktop Batch Tools like ImBatch

    ImBatch is a free Windows tool that can batch process large image files, including resizing and thumbnail generation. You could:

    • Download the files locally.
    • Use ImBatch to generate thumbnails.
    • Re-upload the thumbnails to SharePoint.

    This is more manual but useful for one-off or periodic processing.

    3. Use Azure Functions or Azure VM

    If you're open to cloud solutions outside Power Automate:

    • Deploy an Azure Function or Azure VM with ImageMagick or another image processing tool.
    • Trigger it via an HTTP request or SharePoint webhook when a file is uploaded.
    • Process the file and store the thumbnail.

    This gives you full control and avoids DLP issues tied to Power Automate.

     

    🏷️ Tag me if you have any further questions or if the issue persists.

    ✅ Click "Accept as Solution" if my post helped resolve your issue—it helps others facing similar problems. ❤️ Give it a Like if you found the approach useful in any way.

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