Sorry that the Paste function in Photoshop 21.1.1 is not working and the Camera Raw fiter does not open.
Could you please try resetting the preferences of Photoshop and let us know if it helps? To restore preferences quickly using a keyboard shortcut: Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop.