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When I right click using a MAC on an image, the menu is grayed out and I cannot get metadata or edit in Photoshop
"in book mode"- No it will not be possible (Keyboard shortcuts are different).
In the Book module-
Select the photo on a page, Press keyboard [E], Now you have access to Metadata and Edit-in Ps.
Note: that [Edit in] Ps a raw file photo may make a new derivative image that appears in the Book Collection, but not replace the photo on the book page.
Return to the Book module by [Double-clicking] on the Saved Book Collection or keyboard [Cmd + Opt + 4 ]