Exporting DICOM perfusion/cine as NIfTI gives only 1 dynamic (but Slicer shows 150 frames)

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Hi everyone,
I am loading a DICOM perfusion/cine MRI dataset into 3D Slicer.
In the DICOM browser, the series summary shows:

  • Modality: MR

  • Size: 180 × 208

  • Count: 150 frames

So Slicer correctly detects that this is a 150‑frame multivolume.

When I load the data, I can scroll through all 150 frames. However, when I try to export the dataset as NIfTI, Slicer only saves one dynamic. The resulting NIfTI has the following shape: [180, 208, 1].