If I recall, the reason why you don't see constraints as you've composited them is because Photoshop is assuming you want to reuse that (those) asset(s) elsewhere, maybe even in another document with different dimensions. It really doesn't work the way the interface for Creative Cloud for files does. (You can truly upload your PSDs as they are there and have the thumbnails represent the actual document. See assets.adobe.com.) Bridge CC, of course, can also best represent PSDs as they look locally.
OK thanks, I guess I understand that then, I just wish I could have the option. I think I'll just create a flattened layer of the image and add that to the library, and update that where necessary. Thanks.
We have released a new update of Adobe Bridge (CC 2018) on 16 July 2018. The new version build number is 22.214.171.1243. This version is available to install via Adobe Creative Cloud application.
This Bridge update contains support for CC Libraries. Please check the "Libraries" workspace after installing new version of Bridge CC.
You may need to update the Creative Cloud application and restart your computer to see the updated installer.