Windows not finding Kdenlive files
If anyone happens to have this problem:

from inside kdenlive, copy the video (even better: make a .zip and copy it)
also from there, navigate to a folder which is inside a Git project
paste the video or the archive there
still from inside kdenlive, open a Git Bash, then commit and push the pasted file
exit the file explorer and kdenlive
navigate to the same folder normally and open a Git Bash
git pull
your file will be there.