Perhaps related to https://commons.wikimedia.org/wiki/MediaWiki:Titleblacklist?

(In reply to comment #1)

Perhaps related to
https://commons.wikimedia.org/wiki/MediaWiki:Titleblacklist?

Seems very likely

Unsure how to fix the titleblacklist issue. But the crash issue should be fixed with 10b7a97f6699841027eb60cc7609bff2fea2a720

Yes, probably the blacklist. The app itself should do a very basic check (is the title long enough?) and then blacklist failures should return a more specific message than "Failed" (and should not permit retry with the same name).

You should get back different error codes for the upload system saying your name is too short and for TitleBlacklist rejecting the title...

UploadBase::getTitle() does the check on the extension, and returns a specific error which should come back as 'filename-tooshort'.

Did this get resolved after appending explicit file extensions or is it still happening?

It's mostly title blacklist / other blacklists, rather than extensions

As the Mobile Apps Team is focussing on the new, native Wikipedia app, the Commons app is no longer being maintained by the Wikimedia Foundation. I am WONTFIXing all open Commons app bugs to reflect that we will not be spending time fixing them.

For the full story, see this thread on mobile-l: https://lists.wikimedia.org/pipermail/mobile-l/2014-September/thread.html#7974