Haha! It's so stupid. Adobe could just give photoshop this ability, but they don't.
Try importing a vid into photoshop and it gives you an error message. But here's a tip:
Import your frames using imageready...
Then, if you'd rather edit your animation in photoshop..
Click this button:
This will transfer your project from imageready to photoshop.
Now you can edit, colour, and filter your project as you wish.
If you're worried about the animation, don't worry.
Photoshop also has the frame-by-frame animation tool.
By default, it's hidden. To activate, click Windows>Animation:
You'll see it appear (thumbnail - click to see full image):