SharePoint Document Issues

How to Fix SharePoint List Attachment Conflict on Save Error

Elise Williams Oct 9, 2026 870 views

Question details

Users encounter a 'Conflict on Save' error message when attempting to upload a file attachment to a SharePoint list item.

How to Fix SharePoint List Attachment Conflict on Save Error

Product: SharePoint
Device & OS: not provided
Scenario: Uploading a file attachment to a SharePoint list item while simultaneous background changes or concurrent user edits are detected.
Observed behavior: The file upload process fails, and SharePoint displays a 'Conflict on Save' error message preventing the attachment from being saved.

Before you start

Ensure that no other team members or background Power Automate workflows are updating the exact same SharePoint list item while you are trying to attach your file.

Solution 1Recommended

Refresh the Page and Re-submit the Attachment

Clear the immediate session conflict by reloading the list item view and attempting the file upload again.

The most common cause of a save conflict in SharePoint is a temporary desync between your browser session and the SharePoint server. Refreshing the page ensures you are working with the most recent version of the list item.

Cancel the current upload

Click 'Cancel' or close the list item edit pane to abort the current failed attachment upload attempt.

Refresh the browser page

Press F5 on your keyboard or click your web browser's 'Refresh' button to reload the SharePoint list.

Re-open the list item

Click on the target list item to open the details pane, then click on 'Add attachment' to browse for your file again.

Save the changes

Once the file is selected, immediately click the 'Save' button at the bottom of the pane before any concurrent changes can occur.

Refresh the Page and Re-submit the Attachment

Verification: If the file uploads successfully after the refresh, the issue was merely a temporary version mismatch.

Solution 2

Troubleshoot Browser and Network Factors

Determine if cached browser data or network instability is causing false conflict detections when saving list items.

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Frequently Asked Questions

Why does SharePoint say 'Conflict on Save' when attaching a file?

This error usually occurs when the system detects that the list item you are trying to attach a file to has been modified by someone else, or by a background automated process (like a Power Automate flow), since you first opened it.

Does the Conflict on Save error affect all files in SharePoint?

Not necessarily. It is often isolated to a single list item being actively edited. However, if you experience it across all files and lists, it could be a browser caching issue, a network latency problem, or a wider Microsoft server-side glitch.

How can I prevent save conflicts in SharePoint lists?

To prevent conflicts, coordinate with team members to avoid editing the same list item at the exact same time. Additionally, if your list uses Power Automate, check that the flows aren't triggering infinite update loops that lock the item during manual file uploads.

Document & File Issues