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.
Pocket Scanner - Pocket Scanner is the best app for quickly scanning documents to JPEGs or multi-page PDFs.
Dropbox - Online Sync and File Sharing
DocParser - Extract data from PDF files & automate your workflow with our reliable document parsing software. Convert PDF files to Excel, JSON or update apps with webhooks.
Google Drive - Access and sync your files anywhere
Laserfiche - Laserfiche offers powerful document management software solutions that are easy to implement and easy to use.
Mega - Secure File Storage and collaboration