Air Drop NEVER Works!

Well, hallelujah, for the first time ever, after the latest Catalina upgrade to 10.15.6, I have successfully transferred a file from my iPhone to my iMac via Air Drop. I did nothing other than my usual Time Machine backup, followed by the upgrade this morning.

I was just getting ready to open a support ticket with Apple, but decided to try one more time to document exact steps. Lo! and behold! it worked! Saw my phone in the Air Drop section of Finder and when I tapped my Mac in Sharing options on the phone, it said "sending" instead of "waiting". Took a god-awful long time -- from iPad to iPhone is nearly instantaneous -- but it actually sent & did eventually ping a delivery notification on the Mac. Amazing!

P.S.: Air Drop works between the iOS devices just fine. The iMac shows up in the device list but when I tap it to send, it just says "waiting" and never does anything. iMac is running Catalina 10.15.6. Any help is greatly appreciated.

@den.thed: Appreciate the response, but I've had no success with any of the tricks in those various places, except that I haven't done the "nuclear" option of deleting/resetting Bluetooth connections on my iMac. Since mouse & keyboard are both Bluetooth, once it's off, how am I supposed to "click" it back on, eh? I suppose I'll have to get a USB mouse & try that as well.

I've been through several MacOS upgrades, as I keep all my devices up-to-date, so that's not it. The iMac has never received via Air Drop, no matter what I try. My iPhone & iPad can Air Drop back & forth all day, but that's of no practical use. The Mac has the mega-storage, so I want to move things there routinely. It's shameful that I have to resort to cloud storage to shuffle things around.