Although the tool supports gifs (which was our primary concern and is gone now) it's important to control and make sure that an error message is shown for any other file formats that the tool doesn't support.
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It seems this is working, at least I'm getting an appropriate error message when I try this file: https://commons.wikimedia.org/wiki/File:Sel%C3%A7uk_Turkey_2015.webm
"Der Medientyp der angegebenen Datei wird von dieser Applikation momentan leider nicht unterstützt."
We should double check the code if this covers all unsupported file formats and then close this task.
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Attribution generator is not checking the actual format (jpeg, png, gif, whatever) of the file but what is checks is the "media type": https://www.mediawiki.org/wiki/Media_type. Specifically, it only processes file of media type "bitmap" or "drawing". If file of other media type is loaded AG responses with the error message that @Tobi_WMDE_SW mentioned above.
As it only considers files already uploaded to some wiki, it does not have to bother about the file formats as it has been taken care on the wiki's side.
So, as I get it it, this feature is working just fine.