Ah, I see, thanks for the response.
Aside from CI/CD, it seems that the api & tooling around the designer (in conjunction with other Azure infrastructure) does (almost) allow an automated training pipeline (except, of course, for this one niggling issue we're discussing in this thread). For instance, I was able to prototype a set of Azure Functions that monitor a storage container for new training data and automatically run Inference & designer-built Training pipelines.
@LeeHarper-5286 Did you ever get a response from your support ticket? I have the exact same use-case in mind and have been scouring the documentation for how to create a DataSet with ModelDirectory type.
Did you ever come up with a work-around for this? I'm quite surprised that this isn't currently possible. In fact, I must be missing something, because I don't understand how users are expected to build automated training & inference pipelines using the designer without this sort of functionality.