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The first thing you have to say is thank you to the whole organization and the participants of this great site, I am not a specialist in insects and even less in dipteros.
I often walk through the fields and photograph everything small that moves.
Then I try to classify them, with more or less success.
I've been doing stacking macro photography for some time now.
I don't know almost everything about diptera.
This, (which I confused with a kind of Sírfido) is from 08/08/2017 in Olleros de Alba (Municipality of La Robla - León) Spain



Diptero1 by Alfredo M. Rubio, en Flickr

You can help me identify him.
Greetings and thanks:
Alfred