When building a mobile app with Bootstrap the Theme Manager should be available. It’s currently blank.
I think this may be because the bootstrap folder is now a subfolder of the www folder. Can this be fixed or a work around suggested? This is pretty important. 
Could always create a faux Project and create/edit your custom theme. Then simply overwrite your Mobile Projects files with them Brad. Not ideal but a simple enough work-around to keep your flow ongoing… No idea why its not available though, possible oversight?
Going to build the app without styling for now and hope that the team can fix this in the mean time. I think it was an oversight and should be easy for the team to fix. (I hope).
If all else fails once I successfully build the app I will use your approach. Hopefully it doesn’t come to that.
This has been added to 3.8.3 and works amazing! Thank you!