You can import the files as an image SEQUENCE into AE. Don't forget to set the sequence to the proper frame rate in AE's Interpret Footage settings.
Dave, thanks - i import now the PSD file as "Sequence" and as "Composition - Retain Layer Size" and then i click "Create new Composition from Selection".
Then i get a timeline which shows the correct running time of the video created in Photoshop. All the layers and tracks are there. I also see either an image from the video or a black screen.
But i cannot play it. I can't see different frames of the video - neither by dragging the timeline marker nor by clicking "Play/Pause".
That's certainly an awkward newbie problem - seeing your video, but not able to even play it. But i even watched through the full length of three extremely detailed Adobe/Lynda video tutorials (on the official Adobe site) and didn't get closer to an answer why the video doesn't play in AE.
I have to admit that on importing i get a Quicktime error message. I also studied the official Adobe page regarding that error message and didn't understand it. But i know that when i 'had* Quicktime installed previously, it ruined my system and my mood.
So if you have any quick hint, that would be great. Thanks!
One more thing: I can open the PSD-video in Premiere and actually see it as a video there. Then i can save it as a Premiere project and import this project with the proper command into After Effects. But in After Effects i still don't see it as a video.
Export the video from Photoshop as a movie file. Bring that into After Effects.