How can I copy a file from my MacBook Air to iPhone 16 Plus connecting through data cable?

Sync files from your Mac to iPhone, iPad, or iPod touch - Apple Support

Another way to do it, if both devices use the same Apple ID, is to copy files to iCloud Drive. Once the Mac uploads a file to iCloud Drive, the iPhone will be able to see the file using the Files app.

"How can I copy a file from my MacBook Air to iPhone 16 Plus connecting through data cable?: Want to copy files from macbook to iphone. Both are connected through datacable"

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Transferring through a Cable:

An alternative, if you want to go wirelessly, try using AirDrop. Go here: How to use AirDrop on your iPhone or iPad - Apple Support