I have a very old world (from v 0.4) that is 2.3 gb. It refuses to copy the world to use beta features for Aquatic update because it says there is not enough storage. However, the phone has 44 gigs free so this is not about storage space!

I have carried this world through a lot of versions and really don't want to rebuild it (it's not possible to use the same landscape as it was made infinite several versions ago and the seed generates a completely different world, even if I wanted to rebuild everything (which I don't!).
Cheers (hoping when it comes out of beta this will not be a required step.)