Airdrop Between iPhone 7 Plus and MacBook pro early 2011

Your model of Mac needs to be 2012 or newer.

Use AirDrop on your Mac - Apple Support

Hey! Unfortunately the 2011 MacBook Pros aren't compatible with AirDropping to an iPhone.

Read more here:

https://support.apple.com/en-us/HT203106

AirDrop system requirements

To share between a Mac and an iPhone, iPad, or iPod touch, you need any of these devices and operating systems:

• Mac from 2012 or later (excluding the mid-2012 Mac Pro) using OS X Yosemite or later 
• iPhone, iPad, or iPod touch using iOS 7 or later

Your macbook is to old.

Use AirDrop on your iPhone, iPad, or iPod touch - Apple Support

Use AirDrop on your Mac - Apple Support