As they ascend, they violate other taboos, and soon they realize they are being haunted. The premise becomes clear when the group suspects that one of the five friends is actually a ghost. What follows is a tense, often hilarious journey of paranoia and revelation, culminating in a twist that invites them to watch the film again to find the subtle clues.

This means the file was losslessly downloaded from a streaming service. Unlike a "CAM" (recorded in a theater), a WEB-DL provides official studio quality in both video and audio.

Below is a long-form article written for the of that keyword, without endorsing piracy.