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Name the container something appropriate, I called mine "Fabrication Files". Assign the Gerber and NC Drill file outputs to the new container by clicking the little circle to the right of each output with the container highlighted:
The output folder can be defined by selecting "Change" on the container, the following screenshot is how I have mine set up:
This generates the outputs into their own folders in the folder directory "...\ProjectDir\Project Outputs\Fabrication"
To generate the files, click generate!
Checking the Outputs
After generating the fabrication outputs, Altium will open a CAMtastic window, which is a utility to view Gerber files. A window about importing drill data may appear, just click OK:
It is recommended to step through each layer one by one to make sure everything is aligned and generated correctly. You want to fix errors here and not when communicating with the board house.
Preparing the Outputs for Upload
In order to upload the files to JLCPCB or other fabrication services, a ZIP file has to be made with the outputs. Navigate to the folder where the outputs are and ZIP both the Gerber and NC Drill folders:
Name the folder some descriptive name and that is it! When ready, the ZIP folder is what you will upload when a website like JLC asks you to provide your Gerber or fabrication files.