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Ansbach, garden near Frankenhoehe Nature Park, old deciduous forest, 2023-08-13
on Euonymus japonicus

Seconds after starting our photo session, my model was stolen by a Vespula germanica, so I could only take a few photos. MoschWeb and the T&H key led me to Bithia (geniculata). But I'm not sure as I could not find an image of geniculata.
In this thread: https://diptera.i...d_id=33854 we can see the same "aberrant topvein" and my poor fly resembles that Danish fly.
EDIT: It's a Ocytata pallipes.