If you mean minecraft server as in something like PartyZone's creative plots, then no. If you're building a map, you need to have access to the file of the world so you're able to send it to agh if it gets accepted and whatnot.
Singleplayer worlds are a good example, as you can access the world files in your .minecraft folder.
If you have any questions or concerns, feel free to message a staff member.