How to export a vtk file that can be imported into CARTOMerge

Hi I was wondering if I could get some help with a project. I have a 3D vtk file that I can open on 3D Slicer. I am trying to import this into Carto V6 as a CARTOMERGE file which I can then co-register with the EAM (same as I would an ADAS 3D or InHeart vtk) but when I try and import it I get the following error “Invalid images, image study was not created.” Is there a particular way to export the file in a vtk format that is readable by Carto V6 cartomerge?

You can use CartoExport module in SlicerHeart extension.