Hi MagnificentSeaurchin79
Yes this is a bit confusing 🙂
Datasets are stored as delta changes from parent versions.

A dataset contains a list of files and list of artifacts where these files exist. This means that if we add a new file to a dataset we create a new dataset from a parent dataset and want to add a file, we have to add a link to the file, and have a new artifact containing just the delta (i.e. the new file) from the parent version When you delete a file you just remove the link to the file (no need to change the parent zip)
Make sense ?

btw: Make sure you are using the latest RC (I think we fixed a bug in some edge case I can't remeber regrading Datasets)