Hi Matt,
apparently, you only select one frame of your 4D dataset. To SPM, you can not just give the filename of your 4D data file, you need to specify each frame. You can do that manually by entering a range of frame numbers in the file selector dialog (e.g. 1:400 to read the first 400 frames from a 4D volume). Then, you need to select all 400 frames as you would do with 400 3D files. Alternatively, you can use "Util->Expand image frames" and pass its output as a dependency into the design specification.
Hope this helps,
Volkmar
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