Put the summary of the bug you're having here

What I expected to happen was...:
I thought I would be able to play my survival map on Minecraft just as any other map. I thought all I had to do was sync the maps like it says.

What actually happened was...:
When I synced my maps and tried to play my map I noticed it only downloaded half way. So when I opened the game all of my buildings and other things I spent so much time on survival doing was gone.

Steps to Reproduce:
1. Step one get a map 277.2MB.
2. Step two try and transfer the WHOLE map.
3. Step three try and let it loa if it hasn't crashed yet.
4. Step 4 if loaded play game and see if all is left like it was.