QR code, Quick Share

How to Set Up Quick Share on Windows for Painless File Transfers
In the Quick Share window, select the "Who Can Share With You" option and enable the "Visible to Nearby Devices" toggle. Then, choose the "Everyone" option. You can check or uncheck the "Only for 10 Minutes" box depending on how long it will take to transfer files between devices.
Android users can now share files via QR code in Quick Share
Google is rolling out the QR code-based file sharing method in Quick Share with the latest Google Play Services update.
Google’s Quick Share Reportedly Lets Android Users Scan QR Codes to Transfer Files
During the December announcement, Google revealed that users can simply select the media file they want to share, tap the QR code and have others scan it to start a secure file transfer. It removes the requirement of adding others as contacts, verifying devices or changing the device's sharing settings.
Google starts rolling out QR Code support to Quick Share on Android
The company has finally started rolling out the QR-code-based sharing feature to all supported Android devices – both smartphones and tablets. If you are unaware, the feature has already been there in Samsung phones even before Quick Share became the default file-sharing tool for Android.
Google just made Quick Share even better with QR code sharing
Google is quietly rolling out a new way to share files with Quick Share. Users can now use QR codes to start a file transfer.
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Google Quick Share Broadly Rolling Out QR Code Sharing
Sending files from one device to another in close proximity is already made incredibly convenient with Quick Share. But by ...
Google's Quick Share might soon rival AirDrop on iPhone and Mac - here's why
As for Apple, there's AirDrop, but that only works from one Apple device to another.