Saved video file from Snapchat now buffers, and is now corrupted.

So, I was going through some of my photos on my camera roll, and on one particular video, the video will no longer play. It used to play just fine like any other video on my camera roll, and I don't remember what occurred before and after the video stopped working, but now it's still there. The thumbnail for the video is still there as well, it's just a matter of playing it is what the problem is.

When I try to play the video, it buffers for as long as I keep the video open, until you have no choice but to close the video. The buffering icon is the same one you'd see when you turn off your iPhone (the processing icon, a.k.a., the spinning wheel.) The video is saved from Snapchat, and I thought that might be the problem, but I've saved numerous videos from Snapchat before and after that video, and none of them are corrupted like this file. It's a really precious video that I'd rather not lose.

I would restore the phone with an earlier backup, but the only backup I have is from when the video was still corrupted, so it's no use.

Aaaaaand the video file itself is showing up as 0MB. I am running on an iPhone 6s, 64 GB, on version 9.3.1.

If anyone has a solution to fixing the video, that would be lovely. Thank you for all the responses in advance.