Just got the phone today and I'm using this GCAM port, for the S10
https://androidfilehost.com/?fid=1395089523397913303 it seems to work fine, haven't done any test, just a quick pic and it does seem better quality over the stock Samsung.
I've been using it for about 4 hours and the camera does not fully turn every time, most times it does, but I've had that happen a few times already, where it almost flips all the way to selfie mode, but stops at about 80% of the flip. Interested to know if this is common, I've seen a Youtuber with this issue as well, so just wondering if it's "normal" or not.