[Usability] Content writers couldn't figure out how to select an existing image in Page collection

[grvk]

Steps to Reproduce

1. Clone payload-3.0-demo-bugs
   Note: it's based of the latest demo code + upgraded to beta.25
2. npm install (node version v18.20.2)
3. ./start-database.sh
4. npm run dev
5. Log in
6. Click on Media
7. Upload an image
8. Go back to Main Dashboard
9. Select Page collection
10. Choose an existing media
11. Select an existing image from the list (via checbox)

Expected Result

"Save" button appears to select an image (or some other way)

Actual Result

After selecting checkbox of the target image, UI doesn't really change. User can't easily select an existing image

Recording

bug-existing-img.mp4

[denolfe]

Moved to main repo as this is not unique to 3.0.