Order Files Upload - cart quantity same as files

Hello,

I'm sorry if this has been discussed already but I cannot find such topic.

Is it possible to have a backend option for this plugin to make total cart quantity automatically update according to the number of uploaded files?
This way the total price will be also correct, i.e.
- if you upload 1 file, the price stays the same;
- if you upload 5 files, the price gets 5 x price per unit.

Currently I have to tell users to manually update cart quantity as per number of uploaded files in order to have a correct total price and this way they get confused (this is for photo prints orders)

URL: Photo Prints Order page

Thank you in advance!