I am trying to send enclosures, and AutoSender gives a ‘file not found’ error (Windows)

If AutoSender is unable to access certain files, it is usually a privileges issue.

AutoSender normally runs as user SYSTEM.
Either you can make sure to give SYSTEM the necessary access privileges to the directory you want to use.

Alternatively, you can have AutoSender logon as a different user (e.g. your own user account). To do this, go to Services, select myFMbutler AutoSender and click 'Properties'. Now you'll see a tab called 'Logon' - enter the correct user information and restart the service.

As a third option, if you share the folder for web or FTP, you can use http or ftp paths as well.