When adding an “Action” in SKY view, all available actions listed in BGM, including the type of action are shown as being available to add (e.g. Document, Export, History).

However, in Classic view, when adding an action, we only see in the available action list the actions that are specific to the type of action you are adding.

Unless you are very familiar with what activities should be associated with the type of activity you are trying to add, it is very confusing.