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
Wormhole.app - Wormhole lets you share files with end-to-end encryption and a link that automatically expires.
Google Drive - Access and sync your files anywhere
Internxt Send - Internxt Send is an encrypted file-sharing service that allows you to securely share files with online.
Mega - Secure File Storage and collaboration
Strac.io - Strac helps businesses remove sensitive customer data like SSN, drivers license, passport, bank statements, tax docs, medical notes, etc.