Minecraft Out of storage Bedrock Realm Help.

When I try to donwload my realm world, I get a message that says, "You are almost out of data storage space! Minecraft has restricted access to this feature until you clear up additional storage space." My realm world is 647.84 MB and I have 4 GB of stoarge on my iPad. This issue is for Minecraft Bedrock Editon for iPad, iPhone, and even my Switch! Please help!