SharePoint Document Issues

Fix SharePoint Embed Web Part 'File Not Found' Error for ASPX Files

Algirdas Jasaitis Oct 10, 2026 868 views

Question details

Users need to resolve a 'File Not Found' error that occurs when trying to display an ASPX file via the Embed web part on a SharePoint page.

Fix SharePoint Embed Web Part 'File Not Found' Error for ASPX Files

Product: SharePoint Online
Device & OS: not provided
Scenario: Embedding an ASPX file stored in Site Assets into a SharePoint page using the Embed Web Part.
Observed behavior: The Embed Web Part displays a 'File Not Found' error on a Communication Site, even though the user has site owner permissions and the file exists in the library.

Before you start

Verify that you have Site Owner permissions on both your current Communication Site and an accessible Team Site, as you may need to move files between them.

Solution 1Recommended

Host the ASPX File in a Team Site and Re-embed

Bypass the strict security and scripting restrictions of Communication Sites by hosting your ASPX file in a standard Team Site.

SharePoint Communication Sites often have strict security settings (like NoScript policies) enabled by default, which can restrict ASPX files from executing or being embedded properly. Hosting the file on a Team Site and linking it back usually circumvents this limitation.

Navigate to a Team Site

Open a SharePoint Team Site where you have owner or edit permissions, and go to the 'Site Contents' section to find the 'Site Assets' library.

Upload the ASPX File

Upload or move your problematic ASPX file into this Team Site's Site Assets library.

Copy the File Path

Click the ellipsis (...) next to the uploaded ASPX file, select 'Details' or 'Copy link', and copy the direct URL path to the file.

Update the Embed Web Part

Return to your Communication Site, edit the target page, and add or edit the Embed Web Part. Paste the copied Team Site URL into the website address field.

Publish and Test

Click 'Republish' on the SharePoint page and verify that the ASPX file now displays correctly without the 'File Not Found' error.

Host the ASPX File in a Team Site and Re-embed

Workaround Successful: Cross-site embedding from a Team Site is a proven method to bypass Communication Site scripting restrictions without altering tenant-wide security policies.

Solution 2

Contact SharePoint Administrator for Permission Review

If moving the file does not work, custom scripting settings might be blocked at the tenant level and require administrator intervention.

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Frequently Asked Questions

Why do ASPX files show 'File Not Found' on Communication Sites?

Communication Sites often have stricter security and scripting policies enabled by default (such as the NoScript setting). This prevents executable files like ASPX from running or displaying properly in Embed Web Parts, often resulting in a 'File Not Found' error even if the file exists.

Do I need special permissions to embed an ASPX file in SharePoint?

Yes. You typically need at least Site Owner or Full Control permissions. Additionally, the site itself must have custom scripting enabled to allow the embedding and execution of active content like ASPX files.

Can I change the settings on my Communication Site to allow ASPX files?

Site Owners generally cannot change this setting from the standard interface. A SharePoint Administrator must modify tenant-level settings or use PowerShell commands to allow custom scripts on specific Communication Sites. Using a Team Site to host the file is a much faster workaround.

Document & File Issues