i have a macbook air and i can not see airdrop option ,, what to do ?

There are some settings in either/both of these which may need re-checking in your gear.

• Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

https://support.apple.com/en-us/HT204681

• How to use AirDrop on your iPhone, iPad, or iPod touch - Apple Support

https://support.apple.com/en-us/HT204144

Mine seems to work something like this. Turn on iPhone and choose image there; AirDrop to Mac.

Turn on Mac's AirDrop from Go menu; to start iPhone (camera source) for image to arrive in Mac;

click on highlighted button to start image sharing between iPhone and Mac. Chosen ones appears

in downloads folder; then close the AirDrop window.

Sometimes this doesn't work. No wonder, so I try again. ~ I'd never read how-to-articles beforehand.

content from iPhone

Same kinds of 'iconic tools' are in Mac, to start from the other end; from Mac to different device. Too

old a Mac and this may not work easily. Later macOS seems to do better job in finding devices.