Colorado UAP near mountain top

Saw this UAP on an atving trail somewhat near American flag mountain with my boyfriend. We were alone in a very isolated area. Looked like a cylinder at first then looked more circular. It moved right to left at a steady pace. Seemed very close to the ground, definitely not an airplane. It was hard to tell how far away it was. Didn’t seem to get lower or higher or speed up. Eventually it got too far away and we couldn’t see it over the mountains. At first I thought it might be something blowing in the wind but was way too consistent for that. Didn’t really look like a drone either not sure what it was.