How to prepend user input data to a filename uploaded through Sprout Forms

I have a contact form where users have to fill in a name field and upload a file. I want to add the name the user filled in to the beginning of the filename, eg: firstname-lastname_filename.pdf. I am using Sprout Forms for Craft 3, both the most up to date versions.

Is this something I can do with original Sprout Forms functionality, or will I have to write a custom module or plugin to inject this code? Essentially, what I understand is I will have to find the code in Sprout Forms where the file is uploaded, and inject the code to add the special user submitted name data.