Deletion of Minecraft World

Observed Results:

I installed Minecraft version 1.19.2 in my Android System. I Create a World here. After playing for 30-35 minutes, I quite and Save the game. Next day, I reopened Minecraft, but there's no World. I recreate another new world. After playing I Again quite and save the game. But after sometime, that world also disappeared. 

Expected Result's:

When you create a world in Minecraft, after playing we save the game. When we reopen the game, the game was started from the point, where we left.

Help me