...
To create a new upload profile, click on 'New Workshop Item'. (If you want to upload over top of an item you uploaded previously, use 'Existing Workshop Item')
Step 3:
Under 'Maps to Cook' select 'Add...' and it will bring up a list of Maps that are located in you local /ContentSDK folder. If you are only Compiling a mod, you can skip this step and instead disable the cook packages feature in the top bar.
...