possible to archive a Unity build?

I've run into a problem with permissions on my app, regarding file access. The app works fine when I test it locally, but after I sign it, package it up, and upload it to app store connect, Apple is rejecting it because it isn't able to access the entire file system. They told me to follow some instructions to test the build that will get uploaded by archiving the project, then exporting the archive as a runnable app. However, since Unity builds an .app file directly, I don't know how to archive the project like that. Has anyone had any experience with something like this?

My other alternative is to skip the Apple app store and only publish on Steam, which doesn't seem to care about the apple code signing, etc.