For the last few days I have been unable to save screenshots on Monterey 12.1. When attempting to do so I get the message 'Your screenshot can't be saved - Cannot write file to intended destination'. Normally I would fix issues like this by deleting a .plist file, but I cannot find any related to QuickTime at all. I also now cannot set the save location of QT screen recordings to my external HD, where I would like them. Help?