Custom Header Gallery

So I finally figured out how to edit my header.php to show my image at full width thanks to this link and I’ve listed the solution below:
I also found that there was nowhere to upload a header image in Oxygen theme when it’s self-hosted. Another quick fix! Edit your header.php file, and insert the image in the file.

Right under <div id=”header”;>, insert: <img src=”https://locationofimage.com”;>. It’s really easy if you upload the image through wordpress like any other media, then copy the URL that WordPress gives the image.
If you don’t want any of the header text showing (site title and description), delete these following four lines from the file:

<div id=”branding”>

<?php oxygen_site_title(); ?>

<?php hybrid_site_description(); ?>

</div><!– #branding –>

Save your header.php file. Now your header image should show.

But now I’m wondering if there is a way to edit the code so that it pulls a new header image randomly from a hosted folder?