> I don't think that there is an event that is logged when I place files in any folders
There can be. Right-click the folder and choose Properties, Security, Advanced, Auditing. Turn Auditing on and you can get an event; you can then tell Task Scheduler to watch for that event.
I attempted to save a file in a subfolder, and the only events that I saw under "Security" were the ones pertaining to applying the auditing settings. I selected Successful and Failed for both "Create files / write data" and "Create folders / append
data." The object name that I selected was [username]/[COMPUTERNAME].