I have been doing Quick Import into the Project Bin, as well as opening up the file folder and dropping the file directly into it. ALSO, i have managed to have a FEW files transfer, MTS, but not all. They were all taken with the same camera, same time, and are all MTS files. But I now cannot drop MP3 files either. I can drag and drop, and it generates the progress bar at the lower right corner for a second or two, but it's like vanishing into thin air.
and... i have been gathering files from different drives. The mere fact that it allows me to open up the file folder, even if I was dumping directly from an SD card, means it's seeing SOMETHING I can drag and drop. This is all of a sudden as well.
I JUST upgraded to Win 10 the other night, reinstalled PS23 twice, and it made no difference. I just cannot seem to find the common denominator.