I final found a solution to this problem. I don't know what the issue was that prevented .mov files with Alpha channel to be imported to PSU 23 & 24 newly installed on a new win 10 desktop machine but the fix was installing Corel VideoStudio 19. The .mov with alpha files with a PNG and ProRes video format will now import and work as intended ( either with watchfolders or dropping on timeline ). Many Many thanks to Tony P for getting me thinking in the right direction. The .mov with JPG video format will import but no transparency. PSU 23 & 24 can sometimes behave like a spoiled child needing a spanking and knowing the right paddle to use can be problematic.