cannot load properly GE Vivid 4D US file with Slicerheart

Dear Mr Lasso,
I export from Echopac a 4D clip of an heart US.
When I load it in slicer with SlicerHeart extension, I have a warning " Reference image in series does not contain geometry information. Please use caution." When I load anyway , I obtain a clip in the red window and athin line in the 2 others. Is it a problem with the export format or with Slicer ?
Thank you