Board Thread:Support Requests - Getting Technical/@comment-32381744-20171010140423/@comment-24253265-20171011175200

Xezrunner wrote: I've tried renaming it to .oga, but I get the same error. Okay, that's something serious between your .oga and (as you reported) new uploads to this Wiki (any FANDOM wiki).

Wild guesses, because I can't see what you have, it could be too big, there's a 10 MB limit IIRC. It could contain a cover image or lyrics as subtitles, and I don't think that's supported here. It could be a FLAC (lossless) instead of vorbis. To some degree that would be okay on commons, but FANDOM is at MediaWiki version 1.19, WikiMedia commons and others are at 1.30, so maybe FLAC in OGG is not okay here. Or it could be a "regression", I uploaded several .oga in 2016, and your issue could be a newer bug.