Hey @selrac
If you will get such thing then then namespace is not defined for that , So you can import that namespace in the below bar and can use onward in your project but as per my view better to use always to call full namespace so you will not need to import it and you will not get such error as well.
and for your knowledge you can also use this predefined activities as well as @acaciomelo mentioned.
Regards…!!
Aksh