Hey Yuki,
This is what we are working on right now. Currently SHP file importing
will not work because we are switching the way we handle them, before
we were extracting them all into a single directory, for obvious
reasons this is problematic, so we are making it so that SHP files
export to their own directory. Also with this support we will be
implementing KMZ support as well, this is why we are still in beta.
The other issue is with projections, WSG84 works, and so does any
coordinate system that can be readily converted to WSG84, however,
WSG84 with zones does not work. So we are trying to figure the best
way to deal with coordinate transformation, and we are also looking at
switching to another provider for tile rendering.
Thanks so much for your patience,
Jonathan