Copilot Not Working

Fix Microsoft 365 Copilot Not Summarizing Public or Large PDFs

Huda Qurayshi Sep 28, 2026 869 views

Question details

The user is unable to use Microsoft 365 Copilot to extract specific financial data from a public PDF website, and downloading the 20 MB file exceeds the AI's attachment size limit.

How to Fix Microsoft 365 Copilot Cannot Summarize Large or Public PDFs

Product: Microsoft 365 Copilot
Device & OS: not provided
Scenario: Attempting to summarize and extract financial data from a large PDF report available on a public website.
Observed behavior: Copilot fails to access the external public URL directly, and when the user uploads the downloaded 20 MB file, it exceeds Copilot's attachment size limit.

Before you start

Verify the exact file size of your downloaded PDF document and ensure you are logged into your Microsoft 365 account with active OneDrive or SharePoint access.

Solution 1Recommended

Bypass Size Limits by Uploading to OneDrive or Splitting the File

Since Copilot cannot reliably process direct public URLs or direct attachments over its size limit, uploading the file to a supported Microsoft cloud service or splitting it can bypass the restriction.

Microsoft 365 Copilot often encounters limitations when accessing external public websites for security and indexing reasons. Additionally, direct file uploads in Copilot chat interfaces have strict size limits. To resolve this, you must bring the file into the Microsoft 365 ecosystem.

Download the PDF

Navigate to the public website and save the 20 MB PDF directly to your local computer.

Upload to OneDrive or SharePoint

Log into your Microsoft 365 account, open OneDrive or a SharePoint document library, and upload the downloaded PDF file.

Split the PDF (If still too large)

If Copilot still refuses to process the 20 MB file from OneDrive, use a PDF editor to split the document. Extract only the specific pages containing the financial data you need, and upload this smaller file.

Prompt Copilot with the File Reference

Open Copilot and type a prompt referencing the newly uploaded file by typing '/' or its exact name (e.g., 'Summarize the financial data from [FileName.pdf]').

Bypass Size Limits by Uploading to OneDrive or Splitting the File

Indexing Time: It may take a few minutes for Copilot to index a newly uploaded file in OneDrive or SharePoint before it can successfully summarize it.

Solution 2

Consult the Microsoft Copilot Community Hub

If standard workarounds fail, seek advanced assistance regarding current capabilities and limitations directly from Microsoft experts.

Free Microsoft Office alternative

Summarize Large PDFs Easily with WPS Office

If Microsoft 365 Copilot's file size limits restrict your workflow, consider WPS Office. It is a free, lightweight, and easy-to-use alternative that features a familiar UI for seamless migration. With high compatibility with all Microsoft Office formats and powerful native PDF tools, including WPS AI for PDF analysis, you can easily summarize and extract financial data from large documents without rigid cloud-upload restrictions.

1. Download and Install WPS Office: Visit the official WPS website, download the free software, and install it on your device.
2. Open Your Large PDF: Launch WPS Office and open your downloaded 20 MB PDF document directly within the application.
3. Use WPS AI to Summarize: Click the WPS AI button in the toolbar and prompt it to extract or summarize the specific financial data you need.

Seamless format compatibility with Microsoft Word, Excel, PowerPoint, and PDF files.Free and lightweight alternative to Microsoft 365 with a highly familiar user interface.Built-in WPS AI to easily summarize, chat, and extract specific data from large PDFs.No mandatory cloud-upload requirements—work directly and safely with your local files.

microsoft office alternative - wps office

Frequently Asked Questions

What is the file size limit for Microsoft 365 Copilot attachments?

Currently, direct file uploads in many Copilot chat interfaces have strict limits, often capping around 10 MB to 20 MB depending on the specific Copilot plugin or Microsoft 365 license. Uploading the file to OneDrive or SharePoint first is the recommended workaround.

Can Copilot directly read a PDF from a public URL?

In most cases, Microsoft 365 Copilot cannot directly access, scrape, or summarize external public URLs due to security, privacy, and technical indexing restrictions. It is best to download the file and upload it to your Microsoft 365 environment.

How do I extract specific financial data if my PDF is too large for AI to process?

If your PDF file exceeds the maximum size limit for Copilot, you should use a PDF editor to split the document. Delete the irrelevant pages and save a new, smaller PDF containing only the financial data before asking the AI to summarize it.

Microsoft Copilot Issues