I've been trying to export my Photoshop CC custom shapes library into Illustrator, all in one, go rather than individually pasting them into Illustrator. I guess similar to loading and saving effects files. Can this be done?
Photoshop custom shapes are saved in .csh files, which are only usable in Photoshop. Illustrator doesn't recognise the format.
I guess what you could do is place all the custom shapes, one at a time, in a Photoshop document, and using the Path Selection tool, select all the paths, paste them into a new Illustrator document, and apply a fill to all the shapes. Then save that document, then as you need them just copy and paste into any Illustrator document. Or even select each shape and turn it into a symbol.