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If it is something raw which you have recorded, then there are MP3 to MP4 converters out there which will turn it essentially into a video, which can then be uploaded to your media and then shared to Forums (not sure on file size for videos though, WW??).
If it is somehting generic, there are "content rippers" you can download to your phone/tab/laptop to pull things from youtube, , TikToK etc which can also be uploaded the same way.