Error: Not a valid font file

I was able to install my font on my PC once after emailing it to myself, but after making one edit to the lowercase letter c and trying again, my Windows Font Viewer says it’s not a valid font file. I noticed after my edit, the file size went from 51KB to 48 KB. I am able to export my font on my iPad, and I can install it on Canva and Procreate on my iPad, but not on my PC. Why does my PC say the file is not valid? How can this be fixed?