I have been a long time user and supportive of Papers (from Mekentosj) for a scientific manuscript database, having a library that is nearly 8 GB in size is a testament to how robust the database features are. Previously they only supported Dropbox syncing. I am contemplating using the iCloud Drive on my Sierra based home MacBook and office Macbook? Any thoughts on how this may work? Where to place the "primary" drive?