I am trying to upload spatial data from PostGIS (PostgreSQL with GIS extension) database but cannot find anything regarding spatial data. Is it technically possibile?

Hello,

We don't support Postgres extensions per se and there are not any PostGIS specific types in the types list - you need type them by hand.

You should also be able to retrieve the model from the database via our reverse engineering tool.
 https://www.vertabelo.com/documentation/others/reverse-engineering

Best regards,
Adam Mościcki