Sharing between Android and iPhones just got easier than ever

QR codes to the rescue.
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I found the easiest way to encrypt files on Android (it takes just 30 seconds)

OpenKeychain makes file encryption on Android actually simple, so stop using cloud storage for sensitive data.

Android users can now share files with iPhones via QR code

This feature is for Android devices that don’t offer AirDrop support in Quick Share. Google is rolling out a new feature on ...
TechJuice

Google Adds Easy Android-to-iPhone File Sharing With QR Codes

Google is bringing QR code-based file sharing to Quick Share on Android, allowing users to send files securely to iPhones with ease.