Hello there, it may be a stupid question, but when I create my map in Godot, I'm unable to get the same output as the image. I am a beginner, by the way. Could you please tell me how to use these game assets properly?
I just want to eliminate the gray, annoying background 
Thank you in advance

PS: I have the same problem using Tiled. And I verify that the PNG works well with GIMP

This is me in Godot, and the other is your map. 

This is my user in Discord: kevV#1849