Hello, I'm on a Mac and I've been trying to import my photoshop files into after effects by importing as "composition" and /or"composition, retain layer sizes" but it still comes in as a flattened image. Please help!!
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The most common reason of that is Color mode of graphic that you are importing. Check if your graphics are in CMYK or oher color mode than RGB. If that is the case - just use Image/Mode/RGB color, save that file and try to import to AE - everything should go fine from there.
Also, smart objects will come in as a single flattened layer.
That is normal for a smart object. Importing as a comp should give you a layer for each photoshop layer. There are other changes that can happen with layer styles and other things, but generally PSD import hasn't changed in a long time.