Since moving to Catalina I have not been able to upload pictures from the Photos app on my 15" 2017 MacBook Pro. I select the option to import from Photos after which it will 1) it will act like it is loading photos forever (literally), or 2) occasionally picture images will appear for an instant (literally a blink) then disappear. At that point the photo pane is just blank. Anyone else had this issue? I have had this issue with every website I have tried. My only solutions thus far have been to load pictures from my iPhone/iPad or to export the pictures and load them on my MacBook Pro. I have rebuilt my Photos database once, but do not really want to do that again.