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
Stonly Knowledge Base - Interactive knowledge bases and help-centers
Google Drive - Access and sync your files anywhere
Free Knowledge Base by Dashly - Optimize your customer support with Knowledge Base by Dashly
Mega - Secure File Storage and collaboration
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.