Lost version of an .fms file

I have a .fms file that I modified on 10/8/22 and shared to create an .m4v file. Now when I try to open my .fms file, I do not get the latest version. I always save before closing.

Can you suggest a way to look for the latest version of my .fms file or is there some way I can use my .mv4 file to re-create an .fms file of the latest version of my work?

Thank you.