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.
Dropbox - Online Sync and File Sharing
Lively - Make GIF and short movies from your live photos.
Google Drive - Access and sync your files anywhere
Flip - A seamless way to capture looping videos on mobile 🎬
Mega - Secure File Storage and collaboration
iNZDR - iOS Live Photo Social Media app. Post and watch!