Hi John,
I'm a Fuji kstars imager. Having to set SDCard to Delete is a long standing known limitation. In fact I patched the Indi Fuji implementation to allow saving of that setting in the config.
The other issues I've run into are: aborting a capture can leave the frame in the buffer - the only way to recover if it does is to stop the indi server and power cycle the camera; If the GFX 50SII uses the same autofocus technology as the smaller XTrans sensors you may have an offset region on your calibration frames that needs to be correctly handled when stacking. Siril can take care of this but I don't know about other stacking software.
Regards
Ed

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