[No way to upload world]

When i do that it starts to load then dissapears and when i open the server and go in it is not thw world i want( it did not work)

 

[How do i downlaod my world from the server]

Everytime i try and do that it takes for EVER. What should i do?

 

[How do i downlaod my world from the server]

I would like to downlaod my server but using /dl does not work for me and says that is not a command.