Tilesheet problem help

so i have made a map with tiled a long time ago which when i imported it to the game some objects were missing when you download the tilesheet that the studio gives us there is these 3x4 3x1 2x1 2x3 so used them for example the cars so i made the map but when it finishes the cars and some objects are missing but i can’t seem to understand how can i put them in the studio/game?