Transparency rendering for After Effects Not Working??

Development Rendering
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Hellow All , i am very new at this , following tutorials , i managed to get all working ( i am tracking camera in AE , so i can add my models in UE, But when i export the model after, the background still shows even if i untick them in “view” . This is a link with a short video explaining. Thank you all https://www.youtube.com/watch?v=HRuTT8FFxX8

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I found out how to export with no objects in the render. Now i encountered the problem with BLACK BACKGROUND , i changed the alpha settings , that i found out about in a tutorial. When i import to After Effects , the model from unreal , it gives me a fully BLACK background ( should be transparent ?? ) .

Here i uploaded a video of settings and the after effects problem

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Thank you admin , you can close this post . was not resolved .