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I would suggest clearing the app cache, force closing, followed by a soft reset (powering down the phone and then back on).

Use the "upload a file" button.its almost 17KB picture but not showing or how can I attach picture without URL?
I tried to upload two photos but they came up as an error. I have no idea what "use a different launcher" means in context with my issue. Some have said its a Samsung problem. Is there a Samsung Galaxy S10+ forum? Isn't my phone android?
OK, that helps . I was taking the screen too literally when it says "Recently sent" and I think it really means "recently received" from the phone user's viewpoint. I'll home in the culprit before long. Thank you.You said, "you can check your notification settings and see what recent apps sent you notifications when you here the sound again." How? There is no way I know of to see what recent app sent me a notification. If I had such a mechanism it would be easy to catch the culprit. By the way, I have not installed a new app for more than a year. And do not intend to.