Steps to reproduce:
Visit https://commons.wikimedia.org/wiki/Special:UploadWizard using an account that possesses upload_by_url
(If you are shown the 'learn' page, click 'next')
Select 'Share images from Flickr'
User is shown the form to choose between 'Select media files to share' or 'Share images from Flickr'
User is returned to the 'learn' page