When I used the "PDF to Musescore" tool that was provided, it generated the attached MSCX file. When I go to open it, I get the message that the file is corrupted. How do I fix it? I've tried copying all of the notes, and pasting it into a new score. When I tried to do that, Musescore crashed.
I'm using musescore under macOS 10.14.6 on a 2017 iMac. Thanks!