Under Consideration

NAS private cloud server

I am interested to purchase this software but there is one problem. I would like to purchase for small business, so couple of people will use this software. We have a NAS server, private cloud server. I can do synchronization from PC using NAS sync option but problem is with mobile android/IOS system, you offer just Icloud, dropbox and google drive. Will be good if there is option to store file on private cloud in terms of better privacy and stronger protection.