“World import failed”

MCPE says “world import failed” when trying to import a world [bedrock]
If its failing to import you can try to extract your world folder directly to the games world folder.
You can rename the .mcworld file to .zip and extract it to the folder.
On iPhone/iPad, you will need the files app to do this, for android devices, there is a built in file app too. To do it on iPhone/iPad open the files app, go to "on my iphone" or "on my iPad", then go to minecraft/com.mojang.minecraftpe/Documents/games/com.mojang/minecraftWorlds and extract the zip there. on android its /games/com.mojang/minecraftWorlds/ and you can extract it there.
Good to know: If it doesnt show up in the game after that or if it doesnt let you into the world, then somethin is probobly wrong with the world itself (missing files, corrupt, etc.)