Altium import with hierarchic schematic

Schematic
1

Hello !
I am not an Altium user but I wanted to have a look at an existing Altium project.
KiCad Import went well enough for my purposes (KiCad 9.0.3)

But when I try to save the schematic the resulting KiCad project includes only the first sheet.
It works when I save all sheets seperately as copies in the new KiCad directory and then reassign the sheet symbols on page 1 to the new locations.

Is this the intended workflow to rebuild the schematics structure ?

I think this question has been raised before but I found no answers/confirmation and I would like to know if my proceedings are correct…

Greetings from Chris

2

Hmm you seem to be correct. I can import the Altium project and the hierarchical schematic appears correct and navigable, but saving only persists the top-level.