a friend has shared a directory on his Ubuntu account with me. His directory shows up on my windows devices (two of them), but does not show up on my android device (Nexus 7) using the android app, or on my Apple iPhone 5 using the apple app. All of these devices show up on my account as connected devices. I've even tried un-linking and re-linking my android Nexus 7, but the shared directory still doesn't show up.
How do I fix this?