I created an app called streetgols, where it has multiple account types and is a social platform, I had to design all the backend and the fronted and then I had to connect both of them via API's and test each and individual input and state to ensure the quality and the app itself is functional, since I was the developer most of the documentation of these bugs were videos or written notes with the aid of tools like sentry to track bugs and for session replays.

Every page of this digital product has to be tested. In terms different states the product has, every input has to be tested. Best way to document these are using a recording or writing down the exact steps you took to create the problem because it makes the developers and the creators lives ten if not a 1000 times better.