Hi,
Yes, currently you need to save a file from Lr (to Files or Camera Roll) and then import or place it in Photoshop, using the mobile versions. Using the desktop version of Photoshop, you can import Lr photos and then save them to a cloud document which will then be available for downloading to your mobile version.
https://helpx.adobe.com/photoshop/using/place-photos-ipad.html
There is also a new forum for mobile specific Photoshop if you have more questions or suggestions.
https://community.adobe.com/t5/Photoshop-for-Mobile/bd-p/Photoshop-for-Mobile
regards,
steve
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