Issue Summary

In Confluence, clicking on ‘Upload files’ results in ‘Page Not Found’ error while inserting attachments

Note: 10.1.1 is not impacted by this bug

Steps to Reproduce

1. Setup Confluence 9.2.10
2. Edit a page
3. Click on '+' and Files and Images
4. Insert files and images popup opens
5. Click on Upload files

Screen recording for bug replication - https://www.loom.com/share/4dbfdcd4fcfe4886a164e82f70d7fac7 

Expected Results

New window should open to browse and upload attachments

Actual Results

Page not found error appears on Confluence UI

Workaround

On the Insert files and images popup, click on Choose files button. Then select the file and click on Insert button.