Crash When Using Missing Files Assistant

I’m on Mac OS 12.6. I was preparing a large slide show (200 slides) for a few days on and off. Today I opened the slide show and a number of slides show a red circle and when I click on that circle the Missing Files assistant opens. When I relink a file I get the spinning circle and the finder tells me the program is not responding. I’ve tried restarting and making sure the external drives are attached. Help please!