I've just ruined ALL of the clients' designs. I've changed a cloud smart objects (asset from a shared library) in Photoshop and saved and closed that cloud asset. Now all the designs synced that changed asset and THERE IS NO WAY to go back...
Please do some basic versioning for cloud libraries assets like PSBs and vectors.
This is crucial for teamwork especially when some new designer joins a team and you have to share "edit" access to the Library. It's NOT SAFE to use Libraries in production until then.