I did everything as in this video. https://www.youtube.com/watch?v=A-4lGCu76Sw
Everything works in CC4, but when I export to UE5 there are no morph sliders in UE5.
When I export the toon character from the video to UE5, all the morph sliders are there.
Don't understand, what is the difference?

Works fine here , be sure you ticked "import morph targets" in the UE5 FBX import settings!

Yes I know, import morph targets is on.
but when i do morphs on my character there are no sliders in UE5 but everything works in CC4.

Is this a custom character from somewhere else, or is it using the CC3+ base? It all works fine here so trying to think of reasons you wouldn't be seeing the morphs.

Jeff Kirkland | Director • Cinematographer • Storyteller
Hobart • Tasmania • www.one18films.com
SYSTEM: AMD Ryzen 5 5500 | 32gb RAM | RTX 3060 12gb | 1tb SSD System | 6tb HDD Storage

Are you talking about custom morphs or preset facial morphs?
CC4 will not allow to export body morph sliders , only baked once.
CC4 allows to export facial morphs only.