Attaching Other Documents

I have my default folder location set to:

In my send an email bot, my other documents formula is:

This yields a test result of:

The app saves files to the correct location, but I cannot get it to attach a file to an email.

What part am I missing?

On a note - the folder “Document_Files_” was originally just in my “Drive” - I moved it and then made changes to the default folder locations and where the app saved my files.