attributes not showing

I want to add scenario’s but I can’t figure out how. I want to start creating attributes for the ‘budget game pc’ and for ‘opslag’ and ‘2e opslag’. The opslag (in english: storage) depends on the motherboard if it has a specific M.2 slot or not. So to the motherboards I added the attributes: HDD | SSD | M.2 (if the motherboard had an m.2 slot) or HDD | SSD ( if the motherboard didn’t have an m.2 slot). I also add attributes to the storage components and I added the values: HDD, SSD or M.2. But when I go to the compatibility tap at the ‘budget game PC’ in the product builder plugin, and click at ‘opslag’ and ‘2e opslag’ I click, depends on motherboard. But at the tap depend on attributes it says no results found. What am I doing wrong and is there any guide or something that explains how to make product variations.

Kind regards,
Koen