[Aktungbby]

It is the Heinkel varient V2Schleisen D JAIE with four HIRTH HM 508 C engines:

The design started in response to a 1936 request by Lufthansa, which planned a route over the Pamir Mountains in Afghanistan. This was the primary difficulty in producing an aircraft able to meet the range requirements, because the aircraft would have to lift its large fuel load to 7,600 m (24,900 ft) to clear the mountains. At the time there were simply no engines available with that sort of altitude performance, although Hirth was working on one in the 370 kW (500 hp) class. The Günter brothers proposed to adapt their basic He 70 Blitz airframe to carry four of these engines to provide enough power for the massive fuel load.
The He 116 would use a modified version of the He 70's two-spar elliptical planform, skinned (like the He 70) with plywood. The fuselage was all-new, consisting of a semi-monocoqueduralumin body with watertight bulkheads in case the aircraft were forced down over water. The design shared enough construction with the He 70 that the first prototype He 116 V1 was completed in early 1937. The new engines were not ready at this point, so the prototype was instead fitted with the much smaller Hirth HM 508C of 180 kW (240 hp).

I tracked through list of all German aircraft hitting on Heinkel 1937 https://en.wikipedia.org/wiki/List_of_military_aircraft_of_Nazi_Germany

Heinkel He 112 fighter
Heinkel He 113 (propaganda designation for He 100)
Heinkel He 114 reconnaissance seaplane
Heinkel He 115 general-purpose seaplane
Heinkel He 116 transport + reconnaissance
Heinkel He 118 dive bomber
Heinkel He 119 high-speed reconnaissance/bomber (prototypes), 1937
Heinkel

I've been at this for at least twelve hours...aggravated; as I knew I'd seen this aircraft before. 'Smiling Albert' Kesselring used the same engines in his Seibel Fh104 Hallor: And the engine trail led to Heinkel....