Any tips on what to do if moving the files is enabled? I have it turned on so that PDFs get moved to the library along with the music files and my place holder file will get moved too. I even tried setting it to be hidden but it will still get moved and the my "inbox" folder will be deleted
Yes, you can still use a placeholder file but you need to deny yourself any permissions (so that the file cannot be moved, deleted etc):
Create your placeholder file and name it as required before proceeding.
Right click > Properties > Security tab > Edit
If your username is in the list of 'group or user names' then select it - if not you will need to Add > type in your username > Check names > ok.
Click the checkbox to 'deny' Full Control (which will select all 'deny' checkboxes)
OK > Yes > OK
Now you will no longer have permission to move or delete the file (or do anything with it).
(If you need to delete this file in the future you will have go back into the securities and allow full control for yourself. As the owner of the file you will still be able to do this.)