Minecraft Bedrock Realms

So this has been happening a lot often whenever you try to replace a world into a realm. Everything works well until when the import files reaches about 160 megabytes, (my world carries about 200MB) an Error pops up and stops importing the files. The error shows up as "An error occurred" this has been happening for months and couldn't report it to the bug tracker.  this makes my realm useless.