I was really hoping to hop over to affinity photo couple months ago, but there was something essential missing with masking in multiple exposures, can't remembe

I was really hoping to hop over to affinity photo couple months ago, but there was something essential missing with masking in multiple exposures, can't remember what exactly but everyone on the forums were complaining about that missing feature. Really liked the rest of affinity photo but it was a deal breaker for me.