Issue with Microsoft Copilot windows app. Not accepting pdfs anymore.

Dear ADITYA JAIN

Thanks for posting your question in the Microsoft Q&A Foum. I'm Haien from Microsoft Q&A.  

I'm sorry to hear that you had such a frustrating and unsettling experience with Copilot. The problem you are experiencing with the Windows Copilot app (or Copilot in Windows) no longer accepting PDF files, resulting in the picture: "This file may be corrupted or a file type we can't support. Try choosing another file." is a known, though often intermittent, issue that has surfaced after recent updates. The primary cause for this specific "File not supported" with PDFs in the Microsoft Copilot application may be exacerbated by a recent software update.

To nail this down, could you share

• Your Windows version (Settings > System > About)?
• Are the PDF files stored in your personal OneDrive or a shared folder?
• Do the files have any special protection, like encryption or sensitivity labels?
• Copilot app version (in-app Settings > About)?
• File size/type (e.g., scanned PDF)?

In the meantime, you can try these workarounds and let me know anything news for narrowing down your problem:

• Right-click the PDF > Open with > Microsoft Edge > In Edge, click the Copilot icon (top-right) to analyze the open file—grant text-scan permission if prompted > Ask questions about the PDF content directly.
• Go to Settings > Apps > Installed apps > Find "Copilot in Windows" > Advanced options > Click Repair. If that fails, click Reset.

(Note: Resetting will delete the app's data, including settings, but should not affect your chat history stored in the cloud. Always ensure your PDF is within the maximum supported size limit for your Copilot version (e.g., 3 MB for some contexts, or up to 50MB/20 files in others, as these limits can vary).

For additional information, please visit these articles to know more: File upload in Microsoft Copilot - Microsoft Support and How to Use Microsoft Edge PDF Reader | Edge Learning Center

Please keep me updated with anything new that you were try to each option.

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We appreciate your patience and look forward to resolving this quickly for you.

Warm regards