Unable to open Photoshop group/layer combinations in Fresco

I do apologise if I've missed something, or this has been answered before.

Although I'm a Photoshop user of old, on my MacBook, I've only recently started to use Fresco on my iPad (now an iPad Pro 2020/Apple pencil) for any amount of time.

What confuses me is that, sometimes, when I open a cloud document version of a Photoshop Painting, one time it would open showing all the layers and groups. 

But, more often than not the original file opens in Fresco, showing the image as it was last processed, with all the previous groups collected together under a group with a “PS” identifier.

I haven't found a way to access those layers in Fresco (I can open them in Photoshop on the iPad, but I then don't have the brushes and control I can get using Fresco)

Am I missing something that is stopping me opening these layer and groups, from Photoshop, directly into Fresco