bp_media_upload_handler( string $file_id = 'file' )

function bp_media_upload_handler( $file_id = 'file' ) {

	/**
	 * Include required files
	 */

	if ( ! function_exists( 'wp_generate_attachment_metadata' ) ) {
		require_once( ABSPATH . 'wp-admin' . '/includes/image.php' );
		require_once( ABSPATH . 'wp-admin' . '/includes/file.php' );
		require_once( ABSPATH . 'wp-admin' . '/includes/media.php' );
	}

	if ( ! function_exists( 'media_handle_upload' ) ) {
		require_once( ABSPATH . 'wp-admin/includes/admin.php' );
	}

	add_image_size( 'bp-media-thumbnail', 400, 400 );
	add_image_size( 'bp-activity-media-thumbnail', 700, 700, true );

	add_filter( 'upload_mimes', 'bp_media_allowed_mimes', 9, 1 );

	$aid = media_handle_upload( $file_id, 0, array(), array(
		'test_form' => false,
		'upload_error_strings' => array(
			false,
			__( 'The uploaded file exceeds ', 'buddyboss' ) . bp_media_file_upload_max_size( true ),
			__( 'The uploaded file exceeds ', 'buddyboss' ) . bp_media_file_upload_max_size( true ),
			__( 'The uploaded file was only partially uploaded.', 'buddyboss' ),
			__( 'No file was uploaded.', 'buddyboss' ),
			'',
			__( 'Missing a temporary folder.', 'buddyboss' ),
			__( 'Failed to write file to disk.', 'buddyboss' ),
			__( 'File upload stopped by extension.', 'buddyboss' )
		)
	) );

	remove_image_size( 'bp-media-thumbnail' );
	remove_image_size( 'bp-activity-media-thumbnail' );

	// if has wp error then throw it.
	if ( is_wp_error( $aid ) ) {
		return $aid;
	}

	$attachment = get_post( $aid );

	if ( ! empty( $attachment ) ) {
		update_post_meta( $attachment->ID, 'bp_media_upload', true );
		update_post_meta( $attachment->ID, 'bp_media_saved', '0' );
		return $attachment;
	}

	return new WP_Error( 'error_uploading', __( 'Error while uploading media.', 'buddyboss' ), array( 'status' => 500 ) );

}