I think posting them without a download link would be ok if it’s a true remix…meaning you really altered the song. I wouldn’t just post some edit that didn’t change the tune much at all other than arrangement. The end goal is you want to show your shops as a remixer/producer.
HOWEVER…you should slap your name on it like you made a remix and put that in your playlists when you use them in mixes. Something like this:
Artist Name – Title of Song (Mista Clean Edit)
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NEVER put yourself as the artist. Even when I posted that “remade mashup”, I made sure to give not only the artists credit, but the guy who first made the mashup (and wouldn’t share).