Cubase Mediabay cannot see preset saved in HALIon 6 or HALion Sonic 3.
Load HALion 6 or HALion sonic 3 in a track instrument & open it.
Load in the first HALion slot the preset (it’s just a example you can choose any preset) from Raven library called “A New Beginning”
Right clic on this sound slot and choose “Save As” and save the preset like this
you can see the new preset in your HALion mediabay (you have double “A New Beginning” preset)
Open Cubase Mediabay, locate your HALion user folder and… no new preset show !
So basically the new preset is present in the HALion family Mediabay but not in the Cubase Mediabay ! (even if the preset is “physicaly” present in your User Halion VST3 Preset folder !
I’ve remake some new libaray like : “Eagle” / “Raven” / Hot Brass etc… and it’s the same for all.
Note that I’ve made some years ago the same thing for the HALion 5 Libaries and HALion Sonic 2 Libraries and it’s work inside both mediabay HALion family and Cubase one.