True Shared Directories Across Android and Linux

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I like to keep a shared directory across my phone, tablet, laptop and workstation. I find this quite handy for my password db, getting documents/photos I save on mobile over to my desktop or to sync media out to my phone/tablet for offline use. Seems like a relatively simple goal but it’s been a bit complicated to find something reliable. The obvious starting point would be Dropbox, Box, or even OwnCloud, but these all seem to have the same approach where the mobile apps just let you download the files you want on demand, by default nothing is synced to your mobile device automatically, and any file you add on Android must be saved and then manually uploaded.