Metallic triangular-shaped caught somewhere in Benin, Africa

On June 11, 2016, an person living in Benin (in northwestern Africa) has caught a photo of a bright triangular-shaped UFO. What is it?

Witness report:

I took this picture of my family house with my handphone camera on 12 June 2016. A few days later, when I was looking back at the camera photo folder, only then did I noticed a peculiar object in the sky just next to the cloud. In order to check whether the object is a mere speck on my canera lens, I looked at all the other pictures that I have taken during that time, and did not see that similar shiny object in all my other photos taken. The object looked like it is shaped like a shiny/metallic triangle object. Until today, I could not figure out what that object was.