Bluff Pass and Fan Control are old. I have Backpack & Ace Cut purchased and they will not play in my IPhone 6 whatsoever. I know Backpack is a zip file, and I think Ace Cut is one as well, I haven't had to look it up in 8 months and I'm not near a computer right now.
Chunk. Different story. That's more recent, so it should play the way it should. I've been getting the video errors recently as well, but I click OK and the video plays anyway.
I know a couple IOS updates for IPhone just came out within 24 hours of each other last week. My first suggestion would be to make sure your phone stuff is up to date.
Otherwise, check the downloads in a computer and see what sort of files they download as. If anything, my suggestion would be to play it on a computer and record the video with your IPhone--at least that's how I put the tutorial of Backpack on my phone.
I hope this helps in some capacity