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Also I cant find out if you can test your map in the editor, so I also need help with that.

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10 months ago - /u/MoltonMontro - Direct link
  1. Yes – but you'll have to update the Workshop submission every time you update your map locally.
  2. Save your map, go to the main menu, go to "Single-player", and you can load up your map from there. There are some(?) third-party tools that allow for loading into your map while still within the level editor, but these tools are not officially supported.