Rendering After Effects Comps can be very slow
Captain Mench wrote:
Now -- if you need to export an alpha channel out of AE then you'll need some specific formats.
Welcome home, Mench!
To maintain the alpha channel from AE, the OP will want to look up how to be using two codecs, Animation and ProRes 4444. Both are extensively described in the help system for FCP and After Effects or just google them for several hours of interesting reading. The OP will also need to understand the concept of an alpha channel which, come to think of it, was difficult for me.