Message about "License for caption contributions only" is too prominent.
Despite the message mentioning "caption", it is not immediately obvious that this license refers to just the captions, rather than the files themselves. I had to read it several times to make this connection, and I knew that y'all just added the caption inputs that are posted to Wikidata. I don't think it will be clear to more casual users that UploadWizard targets.
If this message is necessary, there should be an equally prominent message nearby describing the license(s) chosen for the files, and the license for file descriptions.