File Corruption & Recovery

How to Fix a Corrupt Excel File Created by Power Automate

Maira Mehtab Sep 20, 2026 868 views

Question details

The user needs to resolve an issue where an Excel file saved to SharePoint via a Power Automate flow becomes corrupted after recent trigger changes.

Product: Microsoft Power Automate
Device & OS: not provided
Scenario: Saving a daily Excel attachment to SharePoint using an automated workflow.
Observed behavior: The resulting Excel file generated by the flow is corrupted and cannot be opened properly.

Before you start

Ensure you have the original, uncorrupted Excel attachment saved locally or directly from your email inbox to prevent data loss while troubleshooting the automation flow.

Solution 1Recommended

Consult the Microsoft Power Automate Community

Since the file corruption stems from a Power Automate trigger and save action, consulting specialized workflow experts is the most effective way to identify the flow error.

Power Automate workflows involve specific configurations for triggers, file creation, and binary data handling. When a file is corrupted during the save process, it usually indicates a mismatch in file formats or an incorrect dynamic content mapping in the 'Create File' action.

Navigate to the Community Forums

Open your web browser and visit the official Microsoft Power Automate Community website.

Search for Existing Solutions

Use the search bar to look for 'corrupt Excel attachment SharePoint' to see if others have resolved identical flow mapping errors.

Post Your Flow Details

Create a new thread detailing your recent trigger changes, the 'Create File' action configuration, and how you are handling the file content dynamic variable.

Check File Content Configuration: Often, corruption happens if the 'File Content' field in the SharePoint action is mapped to a generic attachment object instead of the actual file content bytes.

Free Microsoft Office alternative

Edit and Manage Spreadsheets Seamlessly with WPS Office

While troubleshooting your automated workflows, consider using WPS Office as your primary spreadsheet editor. It is a highly compatible, lightweight, and free alternative to Microsoft Office that perfectly handles standard Excel files.

1. Download and Install: Get the free WPS Office installer from the official website and install it on your computer.
2. Open Your Spreadsheets: Launch WPS Spreadsheets and open your downloaded email attachments directly.
3. Save and Share Seamlessly: Edit your data and save seamlessly in .xlsx format for full compatibility with your colleagues.

Fully compatible with Microsoft Excel (.xlsx, .xls) formatsLightweight application that opens large data files instantlyFamiliar user interface requiring no learning curve for Excel usersBuilt-in file repair tools to handle minor document corruptions

microsoft office alternative - wps office

Frequently Asked Questions

Why does Power Automate corrupt my Excel file when saving to SharePoint?

This typically happens if the 'File Content' field in the 'Create file' action is mapped incorrectly. Make sure you are passing the actual binary content of the attachment (using 'Attachment Content'), not the metadata or an undecoded base64 string.

Can I recover the data directly from the corrupted Excel file created by the flow?

If the file was corrupted during the flow creation, the saved file on SharePoint might just be empty or contain invalid text mapping instead of actual spreadsheet data. You will usually need to retrieve the original source email or attachment to get the data back.

Does changing a flow trigger affect file creation actions?

Yes. Changing a trigger (for example, upgrading from a V2 to V3 trigger in Outlook) can alter the format of the dynamic data outputs. You must remap the dynamic content in your subsequent 'Get Attachment' or 'Create File' actions to prevent file corruption.

Document & File Issues