I have an IC8 animation sequence that uses motion layers, expressions (digital soul), and visimes (acculips). For my Unity project, I'd like to have the motion layer animation as an FBX and the Expressions/Visemes as a separate FBX. Is it possible to selectively export either or? Is it possible to do this in IC8 without having to resort to separating the elements on the timeline and exporting it that way?

You can create separate animation clips using Collect Clip and MotionPlus.

Load the character in the timeline, and highlight the range that contains animation in the Collect Clip track:

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Right-click the highlighted area and the select Add MotionPlus to Library. A dialog will open with export options:

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By selecting only the options you want, such as Facial Animation, you can create a separate motion clip with just those options.

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I didn't realize you get all those options with the motion clip export! Thank you for the tip!