nikon: Snapbridge and D500 worked with Bluetooth image transfers to my iPhone. Now it does not work

I have the Nikon D500, with the latest firmware and I have not changed anything in the camera.

Snapbridge was working to transfer images between the camera and an iPhone with iOS 11. I would select the image to send and the D500 would automatically connect to my phone and transfer the image.

I removed the D500 from my phone and my D500 phone and reinstalled it following all the steps. I have a connection between the two and the Bluetooth icon in Snapbridge shows a connection to my phone. It also shows if the D500's battery runs out. I can not transfer the images via Bluetooth. I can get them if I transfer them to Wi-Fi, but I like the ease and convenience of Bluetooth.

Any suggestion would be great.