Recently posted to YouTube by the World War Footage channel is what is described (and labeled) as a "secret" ("GEHEIM!") Luftwaffe film, entitled "DER GIGANT - EIN FILM VON DER Me 321, 322, UND 323", about the Messerschmitt 321 Gigant glider. Though the Me 323 is mentioned in the title, only Me 321's appear in the film. The film runs for approximately 28-minutes, and quality of the footage is outstanding.
YouTube - World War Footage: "Hitler’s Giant Aircraft That Could Carry Tanks - Secret Luftwaffe Film On The ME 321 Gigant"
Here is a breakdown of the film's "chapters" by time.
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00:00 – Secret Film Introduction▷
00:32 – Guarded Facility & Security▷
01:05 – Airfield & Hangar▷
01:14 – Prison Labor Workforce▷
01:35 – Fleet of Gigant Aircraft▷
01:51 – Towing the Me 321▷
03:37 – Size Comparison (Me 108)▷
03:54 – Structural Frame Construction▷
04:50 – Wing Assembly Begins▷
06:38 – Wing Surface Installation▷
07:51 – Wing Covering Process▷
09:13 – Finishing the Wing▷
09:40 – Completed Wing▷
10:11 – Tow Aircraft in Action▷
11:29 – Takeoff & Landing▷
12:50 – Opening the Cargo Nose▷
13:23 – Tank Loading Demonstration▷
14:52 – Heavy Tank Loading▷
15:55 – Emergency Unloading▷
17:00 – Payload Capabilities▷
19:00 – Silent Footage Section▷
19:05 – Mass Production Scenes▷
20:55 – Tail Assembly▷
22:32 – Wing Installation▷
23:29 – Ready for Takeoff▷
25:31 – Cockpit View▷
25:56 – Parachute Preparation▷
27:36 – Multiple Gigants on Airfield▷
28:18 – Final Aircraft Lineup