I really struggled with this too just now and after reading the response I thought I had it figured out. Still ran into a bunch of issues with what I was trying to do, which was to first save the file to my DB as an entry on a datatype and also send it via email as an attachment…neither were working until I saved the file to my DB with the find and replace.
Now I can create the file via backend and also save it properly and send it via email.