P1. Working between Premiere and After Effects

There are numerous ways you can take Premiere project footage into after effects.

If you plan to drag /open up your footage into After effects, no matter what technique you use to transfer this footage, you will  need to make sure you export/save your premiere footage as a file that is recognized and can play on Adobe After Effects.

Another way of doing this, which in my opinion is quicker, is to select your clip in your timeline on Adobe Premiere, and right click on them. This should then come up with a few options, choose 'Replace with After Effects Composition', which will then automatically allow you to save your clip as a format Adobe Premiere can read. This saves you the time of manually selecting the settings when exporting your footage the usual way.

Although the technique about saves you a bit of time and effort, it also removes your footage from Adobe Premiere. To duplicate your footage, making it so you have the footage available in both programs, you can copy your original premiere footage first by clicking on the footage and dragging it whist holding the  alt key. That way, when you select one clip, it will keep the other.

Lastly, regardless of which way you when about converting your Premiere footage to AE footage, open up Adobe After Effects, and either drag or file import your converted footage in.