Sorry for the late reply. If you could provide your save, I could check what the problem is.
Viewing post in stuck at the last mission
Sorry for the late reply. My smartphone allows me to copy my saved files and transfer them to any folder other than the "Android" folder. If yours doesn't, the quickest and easiest way is to connect to a PC via USB, which takes just a minute. Unfortunately, if you do not have access to a PC, it will be difficult for you to send anything in this case (unless your smartphone allows you to copy the file).