Aufnalog

The video entitled Aufnalog was posted by County Bluff on July 25, 2018 around 8:51 UTC and was deleted shortly after. The video contained footage of the sky and an unknown location with no identifying features except local flora.

Codes
The audio contained a short Hellschreiber transmission starting around 0:26, which decodes to the text:

Mr. K Veach

The original description of the video

Y ue rad ym S ue rad Z ue rad zqfuo

P

was enciphered using Caesar shift of 12 or Vigenère cipher with key "M." Deciphered, the description reads:

M is for ma G is for N is for netic

D

Theories
The Hellschreiber transmission coupled with the Vigenere key of the description suggests that County Bluff was referring to Kenneth Lee Veach, a hiker who disappeared in Nevada in November 2014. According to several posts Veach had made on youtube under his handle "snakebitemgee," he had discovered a cave that he described as being shaped like an M, and might have been looking for this cave the day he disappeared (source).

The trees in the video footage appear to be Pinyon Juniper, a species native to Nevada, which Veach had discussed briefly in one of his posts on youtube.