I hope you'll check it out. I have an account on funkwhale.it as it allows up to 5GB of storage free of charge, which is the best I've seen for open registration instances (it also happens to be the first I learned of as I use several of the other features of the devol.it who operates that instance, simply because their cryptpad instance was the fisrt thing that showed up when I did a DDG search for Free and Federated Online Documents).