unknown fly/bee?

unknown fly/bee?

Observation - unknown fly/bee? - Global. Description: this fly seemed hairless with a hard looking shiny exoskeleton. as large as the bumbles that were sharing feed.non threatening, first one ive seen in 47 years so do not know what it is, identifyspot it for me please. I have small garden but flowers for th

this fly seemed hairless with a hard looking shiny exoskeleton.
as large as the bumbles that were sharing feed.non threatening, first one ive seen in 47 years so do not know what it is, identifyspot it for me please. I have small garden but flowers for the bees, of which are high in number all day many varieties probably 12 all healthy, no disease or mites etc.