airdrop on high sierra 10.13.4 doesn't work

According to following document, to send items to an iPhone, iPad or iPod touch, or to receive items from those devices, you need a 2012 or later Mac model with with macOS X Yosemite or later.

To send items to another Mac, you need:

• MacBook Pro (Late 2008) or later, excluding the MacBook Pro (17-inch, Late 2008)
• MacBook Air (Late 2010) or later
• MacBook (Late 2008) or later, excluding the white MacBook (Late 2008)
• iMac (Early 2009) or later
• Mac Mini (Mid 2010) or later
• Mac Pro (Early 2009 with AirPort Extreme card, or Mid 2010)

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

2011

That Mac model is too old to use AirDrop with an iOS device.

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