Add sub menu inside rtMedia media tab in member profiles page

functions.php

<?php
// check if function does not exists
if ( ! function_exists( 'rtmedia_add_extra_sub_nav_for_upload' ) ) {
	function rtmedia_add_extra_sub_nav_for_upload() {

		// Check if user is logged in and RTMEDIA_MEDIA_SLUG is already defined
		if ( is_user_logged_in() && defined( 'RTMEDIA_MEDIA_SLUG' ) ) {

			// IMPORTANT Please change the page_slug
			$page_slug = 'file-upload';

			?>
			<li class="rtmedia-nav-item-<?php echo $page_slug; ?>-profile-1-li">
				<a id="rtmedia-nav-item-<?php echo $page_slug; ?>" href="<?php echo trailingslashit( get_rtmedia_user_link( get_current_user_id() ) ) . RTMEDIA_MEDIA_SLUG . '?' . $page_slug . '=1'; ?>">Upload</a>
			</li>
			<?php
		}

	}
}
add_action( 'add_extra_sub_nav' , 'rtmedia_add_extra_sub_nav_for_upload', 10 );

Please the above snippet in functions.php of child themes.