Tile map ldtk is blur in gdevelop how to fix it?

i am new for gdevelop i make and learning everything is fine but my problem now is when i try to make ldtk tilemap its alway blur when i import to my project, i do it like a gdevelop tutorial step by step but it still blur , i dont know what i do wrong, sometime i try to not ad the atlas image , and my tile map still blur, even use atlas image or not, for now what i can do? can i use png instead , i have a file from ldtk its a big png that i make for tilemap , and it look good when i import to my project as sprite, so what should i do ,and thank you for all helping