Other than telling you that it is a fly of some sort, I can't narrow it down without knowing more about it's location, size, habits, etc. In other words, the more we know about an insect's behavior, the better able we are to ID it for you.

Maybe one of the picture winged flies?
hortster

Here is a link that might be useful: Picture winged fly

Looks like a dead ringer to me, hortster! Good call.

Thank you! I had never seen one of those.