J’ai exactement le même problème. Selon Epic Games, ils ont renforcé les règles de dépôt de textures, alors que nos textures respectent pourtant les critères.
i JUST started back doing this, and i updated it yesterday, now my textures are saying “drop operation is unsupported” even though i was doing it RIGHT before i updated ima need a fix for this asap haha
Well in my mind i think they have some auto check list that runs and returns a logic to everything ie it auto drags a texture to mesh to create material then if it creates its true else false like idk about automation ect but this is what’s needed and i would think they have something it just needs expanding for all editor things. Easier said than done tho.