@editable
var Wall : creative_prop_asset = DefaultCreativePropAsset
when I want to add a asset to it, I am only able to select build in Fortnite assets and not ones I created via blueprint Building prop. Is this expected?
As of what is live right now this is expected yes. Allowing editable creative_prop_asset to reference custom prop assets is something we are looking to add in upcoming releases.
Yes, as you discovered there is a limit to how many props you can spawn at the moment. We are looking to improve the way this is handled to provide better tools and systems (i.e. something other than a hard cap) to deal with content being dynamically instantiated.