Have you tried the Indi forum for discussions about problems with Stellarmate and PI?
I know there have been a few discussions.
https://www.indilib.org/forum/genera...tart=444#90350
I use kstars / ecos in Ubuntu on a Pine 64 clone and an old Ubuntu PC and there are some very finicky software issues in all of these. Sometimes a bit slow to respond but there should be working drivers for most cameras .
The camera should be the least of your problems but I know that if you ask the camera to show a high resolution preview then you can get a blank and need to set previews to a lower resolution with some cameras and only check the final images from the drive separately.