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Fix Microsoft 365 Copilot Not Completing Large CSV Tasks in Excel
Question details
The user needs to resolve or report an issue where Copilot successfully processes small CSV batches but fails to complete tasks or report progress for larger tables.
- Product
- Microsoft 365 Copilot for Excel
- Device & OS
- not provided
- Scenario
- Attempting to use Microsoft 365 Copilot to analyze, summarize, or modify a large CSV dataset in Excel.
- Observed behavior
- Copilot handles small batches of data without issue but halts, freezes, or fails to complete actions when handling large CSV tables, without displaying any background progress indicators.
Check the file size and total row count of your CSV file to confirm if it exceeds typical processing limits for cloud-based AI tools, and ensure your data is formatted as an Excel Table before running Copilot prompts.
Report the Issue via the Copilot Feedback Tool
Because this is a known service limitation within Microsoft 365, reporting the behavior directly to Microsoft helps prioritize backend capacity improvements.
Many users experience frustration when Copilot times out on large datasets. Since there is currently no local setting to allocate more memory to Copilot, the official recommendation is to log the limitation via the feedback tool so Microsoft engineers can address the broader service issue.
Open Excel and run your prompt on the large CSV file so that the Copilot pane reproduces the freezing or incomplete task behavior.
Click the thumbs-down icon or the 'Feedback' button located at the bottom of the Copilot response pane.
Write a clear description of the issue. Specify the size of your CSV, the exact prompt you used, and that no background progress was reported, then click 'Submit'.
Post your scenario in the official Microsoft Tech Community forums to see if other users have identified the exact row-count limitation for your specific region or tenant.
Split the Large CSV into Smaller Batches
Since Copilot successfully processes smaller datasets, manually dividing your large CSV file can bypass the current AI token limits.
Try WPS Office for Fast and Lightweight Data Processing
If Microsoft Excel and Copilot struggle with processing your large datasets, or if you are looking for a more efficient and cost-effective solution, WPS Office is an excellent alternative. It offers powerful, lightweight spreadsheet management that handles large CSV files smoothly without the heavy resource drain.
- 1. Download WPS Office: Visit the official WPS website to download and install the free WPS Office suite.
- 2. Open your CSV: Launch WPS Spreadsheets, click 'Open', and select your large CSV file.
- 3. Analyze your data: Use the smooth interface and built-in data tools to process your large tables without cloud timeouts.
Frequently Asked Questions
Why does Microsoft 365 Copilot freeze on large CSV files?
Copilot has underlying token and memory limits when sending data to the cloud for AI processing. Large datasets exceed these temporary memory constraints, causing the service to halt without providing a completion status or error message.
Is there a specific file size limit for Copilot in Excel?
While Microsoft has not published a strict, universal byte limit for all Copilot features in Excel, users frequently report timeouts or freezing when datasets exceed a few megabytes or tens of thousands of rows.
Will converting my CSV to an Excel Table fix the Copilot issue?
Converting your data to an Excel Table (saving it as an .xlsx file) is actually a strict requirement for using many Copilot functions in Excel. However, if the table is still exceptionally large, you may still encounter processing timeouts.
