"In the capture tab, choose Save -> Locally"
I've done that. It still keeps downloading to the Astroberry. I've also set every single setting in the INDI Control Panel to record RAW to the SD card. There's also a nebulous setting in the SETTINGS tab in the INDI Control Panel, for RECORDING MEDIA to be either CARD or SDRAM. I don't know what that implies, but I've tried both and it's made no difference. It continues to make new file folders for the subs and calibration frames (after I've dumped the old ones) and save to them.
What I HAVE noticed, however, is that in the OPTIONS tab in the INDI Control Panel, Astroberry/Ekos keeps changing the UPLOAD setting from LOCAL back to CLIENT the moment a sequence starts. WTF? No matter what I do, it keeps reverting back to CLIENT. I can't get it to stay on LOCAL.
So it appears there's nothing I can do about this, and I have to give up on the camera control panel. Therefore the only things left for me to see if Ekos can non-dysfunctionally perform are whether:
A] I can get Ekos to plate solve through the camera to confirm a target. Right now I'm not using GOTO because I have a single axis tracker, but I still need to be able to confirm I've positioned on a target.
B] Eventually I want to set up my iExos 100 GOTO mount to be controlled to GOTO target by Ekos via plate solving. However seeing as how dysfunctional Astroberry/Ekos is, I don't have high hopes for this.
C] Because PHD2 unfortunately won't dither on it's own, I need to have Ekos dither the mount when autoguiding, both the present single axis SkyGuider Pro and the eventual iExos 100.
D] Polar align. This I already have accomplished in Ekos, doing so through the guide scope, so at least one small victory.
If I can get Ekos to do these three things, then I can still make use of the Astroberry rig because I can then disconnect the camera from the Pi, once I've hit a target, and use an external intervalometer to record subs and calibration frames directly to the camera's SD card, without suffering the ~8 second-per-download penalty Ekos imposes by insisting on downloading the image files to the Pi. This way the intervalometer takes care of the shooting while Ekos autoguides and dithers. If I can accomplish these things, then I can still make use of the Astroberry rig. If not, then the Raspberry Pi will just go in the trash and I'll move on.
Thanks for your reply.