Hi Jaume,

Please check the following code in your bp-custom.php file.

function mpp_custom_create_gallery( $args ) {

	$user_id = get_current_user_id();

	$default = array(
		'creator_id'	 => $user_id,
		'title'			 => '',
		'description'	 => '', //add description if any
		'status'		 => mpp_get_default_status(),//can use any of the status e.g. 'public' , 'private', 'loggedin', 'friends' etc
		'component'		 => 'members',//for user
		'component_id'	 => $user_id,//no need to change
		'type'			 => 'photo', //can change to "audio", "video", "doc"
	);

	$args = wp_parse_args( $args, $default );

	$gallery_id = mpp_create_gallery( $args );

	return $gallery_id;

}
//Automatic gallery creation for groups on group create
function mpp_custom_create_default_group_galleries( $group_id, $group ) {
	//make sure that you have enabled all these types in your Admin MediaPress setiings for the groups component
	$types = array('photo' =>  'Images', 'video' => 'Video', 'audio'=> 'Music', 'doc'=> 'Docs' );

	foreach ( $types as  $type => $label ) {

		if ( ! mpp_component_supports_type( 'groups', $type ) ) {
			continue;//component does not support this type
		}
		$gallery_id =  mpp_get_wall_gallery_id( array(
			'component'     => 'groups',
			'component_id'  => $group_id,
			'media_type'    => $type
		) );

		if ( ! $gallery_id ) {
			//let us create one
			$gallery_id = mpp_custom_create_gallery( array(
				'title'	=> $label,
				'type'	=> $type,
				'status'=> mpp_get_default_status(),
				'component' => 'groups',//for user
				'component_id'  => $group_id,
			) );

			mpp_update_wall_gallery_id(
				array(
					'component' => 'groups',
					'component_id'  => $group_id,
					'gallery_id'    => $gallery_id,
					'media_type'    => $type
				)
			);

		}

	}

	//and so on

}
add_action( 'groups_created_group', 'mpp_custom_create_default_group_galleries', 0, 2 );

function mpp_custom_disable_user_to_create_group_gallery( $can_do, $component, $component_id ) {

	if ( $component == 'groups' && ! is_super_admin() ){
		$can_do = false;
	}

	return $can_do;
}
add_filter( 'mpp_user_can_create_gallery', 'mpp_custom_disable_user_to_create_group_gallery', 10, 3 );

Thank You
Ravi