After downloading, make sure you allow installation of Apps from unknown source, then click on the downloaded apk file and install.
On Android 11 device above after launching or opening the game you will be asked to choose a folder where you can add save data files and other important files too.
But you are advised to select documents folder as a place to save your save or load your Save Data files.
FM 2023 Mobile Save Data Files To Get Real Players Names
Below are the save data files for your favourite clubs in which you can load to Football Manager 2023 Mobile to get real player names.