About [[MediaWiki:Upload source file/en]]
Can we make that message more specific?
(your chosen file on your computer)
I guess that'd require mediawiki:upload_source_url to be
(your chosen, valid, publicly accessible URL)
which sounds mildly weird to me. Generally though I'm good with the idea of making it more specific.
What about making upload_source_file be
(your chosen file from your computer)
and upload_source_url be
(your chosen file from a valid, publicly accessible URL)
?
I made https://gerrit.wikimedia.org/r/#/c/150065/ - Does that sound like a better message?