Tiled - Gray as Trasparent

Hi guys, today I decided to download Tiled to create a map, as long as I found a problem, after having imported some graphics to test tiled I found this problem …

[Gray as Trasparent || Tiled] (https://ibb.co/hJkvHw) <- image here.

Can anyone help me to resolve this problem?

Gray is the background color of the map. What do you expect to see in the transparent parts of your tile graphics? If you expect to see sand, then you need to put the tiles that are partly transparent in another tile layer that sits above the layer with sand tiles.