Junkers Ju86R-1 high altitude recce aircraft

Good day, good people,

I wondered if anyone might be able to help with a couple of questions on
the Junkers Ju86R-1 high altitude reconnaissance aircraft that was in
service between 1943 and 1944?

I have a reference that states that these were operated by a Luftwaffe
unit called the 1./Versuchsverband Ob.d.L. Can anyone tell me in which
theatre this unit operated, and if at all possible, which base(s)?

Is there any (accessible) record of the operations they carried out?

Also, the Ju86P that preceded the Ju86R-1 was given a single rear-firing
machine gun after the first ones were shot down by specially prepped
Spitfire Vs. (It didn't help!) Was the Ju86R-1 given any defensive
armament?

There was also the Ju86R-2, which was a bomber version; did that have
any defensive armament?

Thanks very much!

Cheers,

Dave

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Dave Eadsforth