How can I import saves?

On the mobile version, it is not possible to import saves and it is not planned to implement this feature. 

Can I cross save between the PC and the mobile version?

Unfortunately no, it is not possible to cross save between the PC and the mobile version. 

Can I cross save or transfer data between the iOS and the Android version?

Unfortunately no, you cannot cross save between the iOS and the Android version. You can only cross save between several iOS devices or seve...