Sure. But are you asking about how to actually import and color in Photoshop? Because I can’t help you with that I’m sorry.
Or are you asking about how to export from Animation Paper in order to color in Photoshop? You need to go to the menu File -> Export -> Frames. Then you can choose png as the format and export your whole animation as a sequence of png files.
Let me know if you need me to go into the various options.