Replacing the directory folder of the created world doesnt work.
Is there a way to copy saved world to created MW world?

Thank you

Same problem

I was able to find a workaround:

1. Create a new world via the mw create command.
2. Shut down the server.
3. FTP into the server.
4. Under config/multiworld/worlds/multiworld open and edit the YML file for the newly created world. Copy over the seed for the world you want to move to the server.
5. Navigate to 'world/dimensions/multiworld/<>`.
6. Delete everything in that directory.
7. Upload the directories; data, entities, poi and region.
8. Restart the server

I used this to migrate 5 worlds i had and it worked, but you have to change the seed value in the config file. If you do not you will have issues. Also stoping and restarting the server seemed to be a required step.

Same problem , and the solution mentioned above doesnt work on air world without blocks.