Hey! No worries. Thank you for replying :D I've been hella busy myself. I managed to get it working! Not exactly aware HOW. It has to do with the "refresh" of the screens, for which transitions where not good because they wouldn't carry the updated screen info. Then I learned about TRANSFORM lol, which I had been ignoring. Now the screen shows up outside of frame and moves into frame, always displaying updated inventory content.
And I also made a second "inventory" for a QUEST LOG. It's basically the same system. In-game they're shown differently (a grid for the inventory, a notebook with entries for the quest log).
Your code was tremendously helpful for my project, which I'm lookiing to finish soon (several loose ends to clean up and lots of content to add, but the main mechanics are working).
I'm really looking forward to see what you're cooking! I'm sure you'll be able to do it in a far more cleaner way of whatever I did lol