Dynamically Populate SPO List With Files From Specific Folder?

I have worked with PowerApps some recently and I would prefer if users submitted their requests from a PowerApps form rather than clicking "Add new item" on a SP list page. 

I really only need users to provide a file name in the form. However, I need to present the user with a list of available files in a doc library. Once they select a file, there no need to retrieve additional details about the file as the filename is all that I need.

Can you provide a link or details on how to create a drop-down list of filenames from a doc library within PowerApps?

Thank you for taking the time to provide a response!