How to copy your PC inventory to your ANDROID phone

First on the PC :

1. connect your phone to the PC using a USB cable
2. the phone folder appears in the file explorer
3. copy INVENTORY.DB (your PC's Planet inventory) to the "Internal storage/Download" folder

Next on Android phone :

1. open MY FILES
2. go to DOWNLOADS
3. click on the 3 dots at top right, then SELECT
4. choose INVENTORY.DB
5. at the bottom, click on SHARE
6. choose PLANET SAMURO

et voilà :p

How to prevent the screen from closing after 30 seconds when you're on battery power

disable battery optimizations.