hi "CCCleaner",
this is strange. I have just tested again with my Android Smartphone:
I selected 4 of them, and "it worked", 4 photos have been copied. No freeze. 2120 pictures is a big amount of data...
Again, for me, in my environment, the freeze problem no loger occurs.
This does not mean that Photos application is reliable. Frequently, it "crashes". But those crashes occur sporadically, I am not able to reproduce them.
As a workaround solution, you can perhaps use the "Photo & Video Import (Axel Rietschin)" application (see comment dated december 23:
"found an app that does basically what Photos did for importing and organizing.
Here it is.