Saved Musescore file with cloud and cannot open it again. "Your score could not be opened. Score invalid."

So I don't know why this even occurred in the first place, for some context I wanted to save it to computer, but for some unknown reason it doesn't work, as usual. So I decided to save if to the cloud, changing the original name of the file too, once done, it said something along the lines of "Score could not be saved" after the audio was exported and all.
Weirdly enough, I closed it and it did not ask me to save it, and when I tried to reopen, it said "Your score could not be opened. Score invalid.". The issue that I have with this is that it is on my Musescore app, and more importantly, it is in my files, though only saved in "MSCZ_SAVING" and not in "mscz", as it should have both.
I already tried uploading it online but this did not work, I tried opening it directly in files too, but neither did that had any impact whatsoever. I even tried renaming the file again, because originally it was saved as "Violin theme" and stayed saved as that, even though I changed it to "Thèmes et variations pour guitare."

Please, I am begging for help. I really feel like I have tried everything.