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.
Solid Explorer - Solid Explorer is a powerful Android file manager featuring access to most popular cloud storages, root access and easy extensibility.
Dropbox - Online Sync and File Sharing
MiXplorer - MiXplorer is a mobile app that was designed to make it easy to organize and manage the files on your Android device.
Google Drive - Access and sync your files anywhere
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
Mega - Secure File Storage and collaboration