Screen 4

Screen 4 occurred between July 21st, 2019 and July 23rd, 2019.

The Loop
Screen 4 starts with a distorted music playing in the background and a spinning record, from the music label "Work Them Records". Under the record, there is a sequence of dots and dashes:

_’_ ____ _____ ___ *** **** ___ ***** *** ______ *** _______ ___ **** *********.

On the third day, the stream notification was "Don't fall asleep.". The screen was adjusted, and besides everything already seen, the screen also displayed the opening of the TV show Twin Peaks.

Twin Peaks
The distorted music playing in the background is called "Falling" (as in the stream notification "Don't fall asleep"), and was used as the theme song for Twin Peaks.

Work Them Records has an EP under their label inspired by Twin Peaks, by artist Anetha.

This EP had 4 songs with Twin Peaks' episode titles. But the only title that matched exactly with a Twin Peaks' episode was "Drive with a Dead Girl".

Searching for a quote of that episode that fitted exactly the number of underscores and asterisks, under the spinning record, the only possible option is:

''“I’m very close. But the last few steps are always the darkest and most difficult.”''

The Answer
Isolating just the words marked with an asterisk, on the original display, like this: Results in the text “the last steps are the most difficult.”.

Therefore our answer is: the_last_steps_are_the_most_difficult.