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.
iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)
Dropbox - Online Sync and File Sharing
Blackra1n - (This is an OUTDATED jailbreaking method.)
Google Drive - Access and sync your files anywhere
checkra1n - Jailbreak for iPhone 5s through iPhone X, iOS 12.0 and up
Mega - Secure File Storage and collaboration