Importing the world from your computer
To import your world from your computer you will first need to export it, the guide below will go through the steps of exporting the world from Minecraft: Bedrock on your computer and then uploading it to your server.
Exporting the world
Start up Minecraft: Bedrock on your computer then click on the Play button
You should now be on a screen where you can select your world, instead of clicking on the world as you would to play on it, click on the edit button thats to the very right of the world you want to upload.