For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Insta HMS - Insta HMS is a cloud-based solution that can be used in multi-center clinics and hospital with security protocols.
Dropbox - Online Sync and File Sharing
Qliq Secure Texting - HITECH and HIPAA compliant secure texting & text messaging app for hospitals, clinics, and healthcare facilities to assist medical professionals.
Google Drive - Access and sync your files anywhere
Zipnosis - Zipnosis operates a virtual health care platform that connects patients and clinicians through phone and video interviews.
Mega - Secure File Storage and collaboration