I’m working with Omeka-S 3.1.1 and CustomVocab 1.5.0 to add a custom vocabulary to a resource template. After adding the custom vocab Notation as a datatype to the field Notation, I can see in the resource template that the vocab is the datatype like so:
How many terms are there? Do any other vocab types work? After selecting the resource template, are there any console errors in your browser’s web development tool?