Invisible Tiles when added into a new tileset/the building

[Lobiok123]

Howdy folks! I've been working on alot of buildings for a costum pack I'm designing currently, following Thuztor's amazing guide. I've been encountering some problems though, recently. My main problem is the creating of costum tilesets. By that, I mean, the creation of tilesets in Building-Ed, where I simply move existing tiles into a newly created section. If I try to do that though, every new object I place in the tileset is invisible, meaning that I only see the grid below the tile, but not its texture. The same goes for when the object is placed in the building, only the tiles it stands on are marked, the texture remains unseen. Looking forward to your answers.

 

 

EDIT: I'm dumb. You just have to drag and drop the image of the object onto the grid...