You didn’t say whether the file that you’re importing is a Photoshop (PSD) file, so I’m going to assume that it is.
You need to import the file as a composition.
To import a still image file as a composition, do this:
1 Choose File > Import File.
2 Choose one of the following from the Import As pop-up menu:
• Composition – Cropped Layers
• Composition
There are quite a few things that can prevent importing as a composition. I can’t remember what all of the limitations were for 6.0, but I do remember that using CMYK or other non-RGB color models in Photoshop was one of them.
Actually, this feature set hasn’t changed so much since After Effects 6.0 that reading this page and this page would be a bad idea. The second of those has a link to a script from Paul Tuersley that makes importing a PSD file as a 3D scene much easier. (I don’t know whether it works in After Effects 6.0.)
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Todd Kopriva, Adobe Systems Incorporated
putting the ‘T’ back in ‘RTFM’ : After Effects Help on the Web
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