This is a reply to my contact form. Question was: how is it possible to include the file's owner display name in BuddyDrive loops.

bp-custom.php

<?php
/**
 * @see https://codex.buddypress.org/themes/bp-custom-php/
 * to learn more about the bp-custom.php file
 */
// Exit if accessed directly
defined( 'ABSPATH' ) || exit;

/**
 * Edit each fetched Buddydrive to include the file owner display name. 
 */ 
function sergio_add_display_name( $item = array() ) {
	// Only do this on front-end.
	if ( empty( $item['user_id'] ) || ! is_buddypress() ) {
		return $item;
	}

	// Add the display name to the fetched item.
	$item['user_display_name'] = bp_core_get_user_displayname( $item['user_id'] );

	/**
	 * If we have a display name let's prepend the user avatar to it 
	 * and remove this avatar form the item actions.
	 */
	if ( ! empty( $item['user_display_name'] ) ) {

		$item['user_display_name'] = str_replace(
			'width="50" height="50"',
			'width="20" height="20" style="vertical-align: middle; border-radius: 50%"',
			$item['user_avatar']
		) . ' ' . $item['user_display_name'];

		// Unset the user avatar now it's prepended to display name.
		unset( $item['user_avatar'] );
	}

	return $item;
}
add_filter( 'buddydrive_prepare_for_js', 'sergio_add_display_name', 10, 2 );

/**
 * Insert the display name after the file description
 */ 
function sergio_add_display_name_in_js_template() {
	// Only do this on front-end.
	if ( ! is_buddypress() ) {
		return;
	}

	// Insert some code into the Javascript template.
	?>
	<# if ( data.user_display_name ) { #>
		<div class="user-displayname" style="position: absolute; bottom: 15px; float:left; width:auto; height: 10px; line-height: 10px;">
			<b><?php esc_html_e( 'Uploaded by:', 'sergio-textdomain' ); ?></b> 
			<a style="text-decoration: none" href="{{data.user_link}}" data-user-id="{{data.user_id}}">{{{data.user_display_name}}}</a>
		</div>
	<# } #>
	<?php
}
add_action( 'buddydrive_js_template_before_actions', 'sergio_add_display_name_in_js_template' );