I can't upload my PS4 saves to bedrock editon

As bedrock has been released on PS4 I naturally tried to upload my main survival world to bedrock. Every time I tried to upload the save it would crash my game. Therefore I tried other worlds and they did work. I believe this is cause by a file size difference, as my current survival world is 400mb, while all of the other worlds I was successful with uploading were 60mb-120mb. I would prefer not to start a new world due to bedrock not being optimized for larger world files.