Can't find my lost .mlt files in Autosaves file

[Hudson555x]

Here is a great post on how Autosave works.

Autosave not working

Autosave is always working and cannot be turned on or off. It does not save to your existing project. It saves to a hidden file in your app data directory, and then that is checked when you reopen a project. It is only meant for crash recovery. Every 30 seconds it checks if the project is modified (window title bard shows an asterisk except macOS which uses the red dot) and saves to this backup. In case you think it is not working, make a change, wait 30 seconds, and look at the end of View > A…

You might want to consider doing a Save As (naming each save different from the last).