On device(Android/PC), open Setting from the menu in the top left corner in-game
Click Share Save
Click Export and copy the 6 digit share code
On another device, also open Setting and click Share Save
Type in the 6 digit code
Click Import
Alternative method:
Export your android save
Copy the save file from Android
Path: /storage/emulated/0/Android/data/com.enigmadev.uploadsimulator2/files
If you unable to find the path, you can use USB debug with adb to retrieve the save file:
cd storage/emulated/0
cp Android/data/com.enigmadev.uploadsimulator2/files/savegame.save savegame.save
And you can find the save file in /storage/emulated/0
Paste to PC %appdata%\Godot\app_userdata\Upload Simulator 2 with filename savegame.save