if you using mac or linux, try this command
1. cd /path/to/root/of/them/folder
2. zip -r /path/to/new/zip/file.zip *
A new "file.zip" will be produce and it there you should see folders like "framework, preview, icon..." etc. All those folders MUST be top of the zip file and NOT under any...
To get 3D buildings, you have to zoom in close and put 2 fingers like this \ / on top of the screen and drag down to switch to 3D mode. Also you can put two fingers like | | and rotate around to rotate map.