Wow! I've never had a post removed in this way by Apple! I'll try this again because I believe the relative information is important for Apple and it's communities to share in order to arrive at a solution to this ongoing problem with Monterey Airdrop and Bluetooth connectivity...
I was able to send files and photos from my Mac mini 2014 with Catalina and nothing changed when I upgraded to Monterey 12.0.1, bluetooth and airdrop all still worked just fine.
However after upgrading again to Monterey 12.1 Airdrop from my Mac to either my 2017 iPad Pro 12.9 or my 2020 iPhone SE was no longer possible, and upgrading a 3rd to Monterey 12.2 last night I had hoped would fix the problem but alas no the problem still exists.
My iPhone SE is running with the latest "Bravo Echo Tango Alpha" and my iPad Pro still on iPadOS 15.2. It really doesn't matter which version iOS the problem is with Monterey and bluetooth regarding Airdrop.
Conversely I'm able to receive Airdrops from my devices to my Mac. But when ever I want to send something to my phone I'm forced to attach to an email I send to myself then open that on my phone and save.
I honestly think Apple can do better it seems such a simple thing really...