Airdrop hangs on my mid 2012 MacPro running Sierra. Can High Sierra help?

It's always possible that a new Install or Reinstall could fix it, but on the surface Sierra doesn't seem to be the problem...

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

Unless it's Transfer between a Mac and an iOS device...

To transfer files between a Mac and an iPhone, iPad or iPod touch, the following minimum requirements have to be met:[12]

Running OS X Yosemite (10.10) or later:[4]

• MacBook Air (Mid 2012) or later
• MacBook Pro (Mid 2012) or later
• iMac (Late 2012) or later
• Mac Mini (Late 2012) or later
• Mac Pro (Late 2013) or later

Running iOS 8 or later:[6]

• iPhone: iPhone 5 or later
• iPad: iPad (4th generation) or later
• iPad Pro: iPad Pro (1st generation) or later
• iPad Mini: iPad Mini (1st generation) or later
• iPod Touch: iPod Touch (5th generation) or later

Bluetooth and Wi-Fi have to be turned on for both Mac and iOS devices. (Both devices are not required to be connected to the same Wi-Fi network.)

https://en.wikipedia.org/wiki/AirDrop