The save destination is set to external, but the world cannot be restored. (Android→data file is not displayed)
Postscript → It is not possible to save there due to Android specifications ... It would be nice to be able to restore the world from all files.

As you can see in the picture1... the location of the path where the current world is saved.

9/4 (Sunday) (Japan time) Postscript→I will send it again, but if you restore the world from the Minecraft app, the "data" will not be displayed. (*Photo 2 is the screen of Minecraft, Photo 3 is from the main unit setting file. (*Photos 2 and 3 are different terminals.)