I was trying to upload the tarballs for the next mediawiki release into phabricator to share them with the release team, but Phab currently limits uploads to 10MB. Please increase this to at least 20MB.
(For the records, this was filed after T87275.)
storage.upload-size-limit is currently set to 10MB and we currently don't plan to increase this - see T160#2170 for some reasons. For files larger than 10MB to link to from tickets, existing workarounds (upload to a wiki, server, youtube) might have to stay around for a while...