BoxCryptor - Boxcryptor encrypts your sensitive files before uploading them to cloud storage services like Dropbox, Google Drive, Microsoft OneDrive, Box, and many others.
3uTools - 3uTools is a most efficient iOS file and data management tool for Apple users.
Mega - Secure File Storage and collaboration
Blackra1n - (This is an OUTDATED jailbreaking method.)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