Bob_Gardner even though I can't see any files using Finder from the iMac
You might have deleted the files, but forgot to expunge it. Reconnect the ASIAIR's Samba server to the Mac. See if the files are still in the trash folder (the trash can in macOS is a folder named ".Trash" in your user folder).
If the files are still in the trash, just clear the trash to expunge it.
If all else fails, use the Files Manager in ASIAIR and see if you can use the icon that looks like a paint brush (next to the eject button) of the drive -- make sure you don't have any useful image files before trying that. With ASIAIR v2.0.0, check first to make sure that the folder of Dark Frames for auto-guiding is not in there (otherwise you will need to re-generate them).
Chen