Question on taxonomy-custom.php and the GP "content" path

I am trying to create a template for Custom Taxonomy, using the archive page template.

To do this, typically (as I understand it) you simply copy/paste the archive.php page and rename it taxomony-{slug}.php with the "slug" being the name of the Custom Taxonomy.

All nice and simple and that works.

I have a child theme setup and I placed the taxomony-{slug}.php in there and it worked just fine.

However, I notice that in GeneratePress there is this code:

/*
 * Include the Post-Format-specific template for the content.
 * If you want to override this in a child theme, then include a file
 * called content-___.php (where ___ is the Post Format name) and that will be used instead.
 */
get_template_part( 'content', get_post_format() );

So, what I thought would work would be me copy/pasting the content.php file, modifying it, then placing the renamed content-my-slug.php like this:

/*
 * Include the Post-Format-specific template for the content.
 * If you want to override this in a child theme, then include a file
 * called content-___.php (where ___ is the Post Format name) and that will be used instead.
 */
get_template_part( 'content-my-slug.php', get_post_format() );

^ I placed this in the child theme and it didn't work.

So! My question is, what is the correct way of finding the 'content-my-slug.php' in my child theme? Do I need to add more code? WordPress can't seem to find it.

Thanks!