To export just go to the menu SynthRiders > Export Stage Bundle, you will be asked to set the Name of the Stage Bundle, once the name is set press Export.
When exporting your stage in Unity go to Synth Riders > Export Stage Bundle then check the box "For Spin mode?"
The below information is only required if using a version of the template before v0.41. Otherwise just use the PC instructions listed above.
To export a stage to Oculus Quest you'll need to change bulid target to Android and go to "File > Builds Settings > Player Settings and on there make sure that the XR Settings look like this before exporting the custom stage " -shogoki