Black flying saucer seen over Azores, Portugal

On February 24, 2018, a witness saw a possible dark flying saucer of the archipelago of Azores, Portugal.

Witness report:

I noticed a strange hole in the clouds and took my phone to take some pictures just for fun since the hole in the clouds was really unusual. At the time of the photo I havent seen any object. Only some days after, I was checking the photos and realized it had a strange dark object where the hole in the cloud is. Initially I thought it could be a bird or some balloon, but I took several photographs, one after another, in a matter of 3 to 5 seconds, and the object only appears in one photo. I did some contrast analysis in the photo and it doesn't resembles any plane or helicopter or bird that I know. I would appreciate to have some feedback of Mufon on your conclusions. Thank you.

Source, 26th February 2018