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I have yet to attempt uploading from mobile, but you should be able to go to the Edit Videos page of a trope directly (even on mobile) with this link https://tvtropes.org/pmwiki/video_examples.php?groupname=Main&title=InsertTropeName
and replacing InsertTropeName with the trope you have in mind. The pop-up works as normally on mobile as it does on my laptop, at least.

Is there a way to do this?