Minecraft world not saving

Access Application Data\.minecraft\saves. ...

1. Make a copy of the corrupted world folder & all files & folders inside, and rename it however you please. ...
2. Start Minecraft and create a new world, then save and close Minecraft. ...
3. Go back to Application Data\. ...
4. Cut the files (but not the folders) from the new saved world folder.
5. how-to-recover-corrupted-saved-world

Maybe your whole Minecraft data is corrupted. Try to save your worlds on a flashdrive and then delete Minecraft and then redownload it and put your worlds back on it.

For this you will need to copy your world and make it available in a forum for download. Regular Minecraft save worlds to %USERPROFILE%\AppData\Roaming\.minecraft\saves\, Windows 10 edition saves worlds to %USERPROFILE%\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\
LocalState \ games \ com.mojang \ minecraftWorlds. Worlds are saved in different formats so you cannot copy worlds from java based version to windows 10 version.

this file worked for "C:\Users\Your PC Name\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds"

In Minecraft, the world is saved to the account that is "Player 1" and starts the game first.

When the second player joins that world, he is saved together with the world in Player 1's save slot.

If the second player starts the game themselves, they start a new game with a new world and empty inventory, as they have no access to Player 1's savegame. To prevent that, make sure that Player 1 starts Minecraft and enters their world, and that Player
2 then joins that session.

If you want the two players to be able to play independently on the same world, you would need to rent (and pay for) a Realm that is hosted on Minecraft's online service.

You might be lucky, that the cloud save hasn't been updated with the crashed world yet.

In that case, try the following:

Go to the Minecraft tile in "My Games and Apps", and press the Menu button. Choose to manage the game.

WARNING! The following steps will delete the local save storage! If the other worlds haven't been synced with the cloud, your saves will be gone!!!

So if you are willing to take that step, clear the LOCAL save storage of your Minecraft game.

DO NOT choose to delete the games from all consoles (i.e. the cloud storage)!!!

With the local save gone, start Minecraft.

The console will then try to re-sync the local saves from the cloud.

If that worked, you might have a working world from a previous save.

To prevent such things happening in the future, consider backing up your worlds regularly with these instructions: https://help.minecraft.net/hc/en-us/articles/360034754912-Backing-up-Minecraft-worlds-