Cool trailer! To be honest the photography was actually pretty good, if the rest of the documentary is like that visually then thats awesome you should get a few people complimenting that. Definitely I think you could offer it to some on demand platforms, if it is 4K then u can actually submit to netflix, or try out amazon, Hulu, Stan etc etc. If that doesn’t work out though and u can’t make money from it, I reckon your best bet would be to just upload it to YouTube, who knows maybe the documentary will get some good views. Although you wouldn't make much, you could get a fan base going for your next projects if it was on youtube. What do you think? Also I’d love to know more about the doc, what made u wanna create this?