Help on filenames OJS 3.1.1.1 (or help to understand how this works...)

Hello everyone,
I need some help to understand (and possibly change) the file name process in OJS 3.1.1.2.
When files are uploaded they have a self speaking clear name:

this is an example at copyediting stage:
Original%20file%20names

If you download the same files, the return is the following:
file%20names%20generated%20using%20download

It is very confusing and you can imagine what the file list looks like after review, copyediting, production etc…

Am I doing something wrong and is there a way to improve this?
Thank you for any suggestion!
Lucia