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
Impresso - Create beautiful promotional social videos with your iPhone
Google Drive - Access and sync your files anywhere
PHHHOTO App - PHHHOTO App is a free to use mobile application that allows the users to set frames to your videos and then share it with the others.
Mega - Secure File Storage and collaboration
Cheeze - Instantly trigger a camera by sending Emojis on Messenger 😺