Experience Cloud: Image Upload Fails with Error "There was a problem uploading the file" from Rich Text Area or Components

To resolve image upload errors in an Experience Cloud site, enable the "Allow access to standard Salesforce pages" setting.

Steps to Resolution:

1. Navigate to Setup | Digital Experiences | All Sites.

2. Click Workspaces next to the affected site.

3. Click Administration, then select Pages | Go to Force.com.

4. Check the box for Allow access to standard Salesforce pages.

Considerations:
Enabling this setting allows access to standard Salesforce pages within the site.
If this was previously disabled, evaluate the impact of allowing standard page access before enabling.