- go to commons without flickr import rights
- upload a file
- remove it
- flickr import button incorrectly appears, and actually provides the flickr UI
- the user can be tempted to import from flickr, and will get blocked after providing a URL with the very cryptic "permissiondenied" error message
While you're at it, please also check whether the buttons behave correctly when going back to step 1 after fully uploading a file.