I experienced a feature on my apple watch today that is now my all time favorite. I walked my dog down to the mailbox which is located about .5 mile away. As I walked back within site of the Shop, my watch made a new sound. I looked down and saw the following message: "XXX" left behind. This item is no longer detected near you. It was telling me my iphone was no longer near me! I patted my pocket and sure enough, it was not there. 1.) I don't normally carry my cell phone in my oversized safety vest pocket. 2.) I picked up a bunch of branches in the road beyond the mailbox. 3.) Sure enough, my phone was on the side of the road.
Somehow, at some point, I had turned on the "Notify when left behind" feature when setting up some Find My features.
I found an article online how to set up this notification so you can verify you have it set up on your apple watch and iphone or ipad. https://www.makeuseof.com/how-to-use...behind-iphone/