TestRail’s web-based test case management is used by thousands of great QA and Development teams to efficiently organize, track and manage software testing.
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
PractiTest - PractiTest is a cloud based Innovative test management tool.
Google Drive - Access and sync your files anywhere
Sauce Labs - Test mobile or web apps instantly across 700+ browser/OS/device platform combinations - without infrastructure setup.
Mega - Secure File Storage and collaboration
Qase - Test case management software for QA and development teams that helps you make your product better.