Video and music app questions

I did a quick search on the forums, and couldn't find any thread similar to this one. I apologize if this is the wrong the thread group to post this in, and for the generic thread title I have many different questions pertaining to this subject however.

Video app -

Is there anyway I can generate a playlist for videos such that a video will play automatically after one finishes? If this is not available, is there an autoplay next file function?

How do I get files that have different codecs and containers like mkv to be recognized inside the video app?

When I go into my videos, I see all the files contained in my entire library joined together, ignoring which folder they belonged to. Is there anyway to display the proper folder hierarchy reflecting the folders the files originated from?

Music app -

My computer's display will turn off while I am playing music, I feel that since the computer is producing activity (playing music), an idle state should not be triggered. Is this not possible to achieve?

I have album art embedded into each of my .mp3's or .flac's, but the music app does not seem to be picking it up, why is this?

On the now playing section of the music app, there is no search for quick finding of a song. There is a scroll display where you can seek specific songs in some order, but if you have say, 700 files, it can be unruly to search. The same goes for looking at the my music part of the music app. What alternatives are available to me?

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