But if you use a map (folder) in the local MCPE in pmmp, pmmp creates a different map, you have to convert the java map or pe to pmmp. ~ but I do not know any way, without a pc.
It's supported with the LevelDB php extension https://github.com/pmmp/PocketMine-MP/blob/3.6/src/pocketmine/level/format/io/leveldb/LevelDB.php
When we put the "minecraftpe\worlds" map in "PocketMine\worlds", the map does not appear inside the server, as we change the properties for the map name copied, it creates a new world.
"Local MCPE" in the "worlds" folder, which has no "region" and "level.dat" is the same as Pocketmine needs the world to work, but the local MCPE does not have that. You would have to convert everything from the local MCPE world folder to "region" and "level.dat", so I do not know how to do this without a pc.
You do not need to convert the format, pmmp already supports tgat format, its because you are missing the LevelDB extension
So, how do I remove the "crash" from the PC map? It would be even better. ~~ The world goes full with all files, including "levelDB" and even then the world does not work on pmmp.
Its not the fault of the world or pmmp, but rather the php you use does not have the LevelDB php extension