Weird invisible UFO captured over Denver, Colorado

On February 18, 2017, a witness was going to work in Denver, Colorado, when he has taken a photo where appeared a mysterious and unidentified shape. This UFO was not visible to naked eye but it is real!

Witness report:

I was out front at work and took a burst shot of 24 pictures of the clouds, after looking on the computer seen this object appears on frame 17 of the 24 pictures. looking at the images before and after it looks to have a path but need someone with expertise to look at it. I have all the original files that show another object later in the sequence. I also have other images showing white orbs or dots shooting across the sky if interested.