That is weird. I import my mesh .obj into Unity as asset, put it there in the scene. The texture that was transparent is now have a black background.

That is weird. I import my mesh .obj into Unity as asset, put it there in the scene. The texture that was transparent is now have a black background.

Solved
I have to put, the asset in Tree-ambiant-occlusion folder
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Thank you for posting your solution.
That flower came out really well. Looks great.