Subset downloads don't work

[TinyFossils]

I created a 'master' collection to include a number of collections within an umbrella. If I search for that master collection, and I go to the full details and then to metadata and references, I can see that there are other collections that are a subset. However, when I try to download this 'master' collection, it does NOT download the occurrence data from those subset collections. It also isn't clear in the 'basic' collections search that there are subset collections.