I used to be able to very quickly transfer a large number (50 plus) of RAW photos (24mb each) using the Apple SD card reader to USB-C transfer to my 12.9" iPad 2018 (3rd gen.) when it ran the ORIGINAL iPadOS but with the subsequent beta updates all the way through to today's 13.5 that process now takes so long I don't even bother doing it anymore. What has changed in iPadOS that made what used to be a very fast transfer process into a too slow useless process?
I used to review photos before leaving a location to make sure I got what I wanted but now I don't even bother taking my iPad with me anymore.