This is the beginning of an app that I'll use to manage the definitions of "features galleries" on my SmugMug site on daveham.smugmug.com.
I started the app using my reference starting configuration repo.
This app will use the SmugMug API to manipulate the galleries.
The app will also use the JavaScript SDK for the DropBox API to store and manage the metadata that defines the relationships between features galleries and full galleries.
Here is an example of a feature gallery and its corresponding full gallery from Palo Duro Canyon State Park:
Rock Garden Trail Feature gallery -> Rock Garden Trail Full gallery