WiGLE.net

Hi, I have two phones with marshmallow. One have exported database at data/data/net.wigle.wigleandroid/files but I can not find exported database at second one. There is only android/data/cache

Sounds like second phone doesn't have access to the virtual sdcard, it will need approval, you can dig into the settings in the android applications menu to give it. Without that approval it can only write to the per-app storage that's not accessible from outside the app.