To transfer files using Mail on your iPhone, see Use AirDrop on iPhone to send items to nearby Apple devices.
To transfer files using AirDrop on your Mac, see Use AirDrop on your Mac to send files to devices near you.
Files sent to your iPhone are located in the app where you saved the file or in the app that opens automatically when the file is received. Files sent to your Mac are located in the app where you saved the file or in the Downloads folder.