@HeyDoomsday Here are the steps for adding a PGN to a study:-
1. Open an old study or create a new one
2. click on add a new chapter
3. Then there will be a pop-up for creating a new chapter in that, there is one option with PGN written on in it, click on that.
it is at the slight upper side of the right most part of the pop-up. Here is an image to help you locate it.
4. Now you can either paste your PGN there or choose a pgn file from your device.
5. Click on create chapter now you will have your game or games added to the chapter.
I would like to clarify that you can upload multiple games at once.