Not quite the correct application but linkwarden would work. Stores all your links but also backs everything up via html, plain text, and pdf. You can categorize content and tag content. Then there are filter and search tools.
You can just give it PDFs and it will import them over as well. Only saves them as a pdf but still would work.
I’m guessing this is not the best approach but wanted to give you options.
IIRC a trick you can do is take a heat gun (or failing that a hair dryer) and warm up the magnet gasket border thing. Then close the door and leave it for a bit. Something about it better forming to the correct shape and making a better and more consistent seal.
Couldn’t hurt!