1 person found this helpful
Premiere Pro understands alpha channels, but it doesn't normally need to display them. You can know that you have an alpha by selecting the Alpha control from the Output button in the Program monitor
You can also verify that you have an alpha channel in After Effects by clicking the transparancy button in the comp window
When you output, make sure you select a codec that supports an alpha channel (transparancy).
I hope this helps.
Thank you very much!