Ledsteplin
Ambassador
That is exactly what I did and I was able to see the send option (white arrow w/ a blue background) as depicted in my previous screenshot. In fact, I just did it again a few seconds before responding to your reply and I got the same results.
No clue then. But I'm not the only one seeing this. When I tap the photos app icon in Messages, It brings up my camera roll. I tap a photo to send. It shows the blue check on the image. But nothing happens. I have to close the messages app, then open it again. Then it shows the photo ready to send. Not sure why some see this behavior, some not.