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Still no photo attached... Maybe your file is too big or something else is wrong with it? :)
Concerning the rarity of flies - there are lots of Dolichopodidae, Empididae as welll as representatives of other families of flies in Baltic amber, so basically there is no need to make fake inclusions. On the other hand, there are only several genuine inclusions with lizards or pieces of frogs, so such kind of fakes would be more expedient :) I don't believe it is possible to make a fake inclusion with fly that would fool a specialist of that family.