I will first play on my mobile phone and then download on my computer. How to synchronize my computer with my mobile phone？
Alternatively, copy the save to Google Drive on your mobile. Then open the folder with this file on your computer and put it in the saves folder.
Path to saves in Android:
Phone\Android\data\www.townofmagic.com\files\saves
In Windows/Linux, the saves folder is usually located inside the "game" folder.
If you're lucky, you can use the Ren'Py synchronization service inside the game itself (note the button at the bottom, on the saves screen), but this service is often overloaded in many regions.