Enable SVG support and enable svg upload

svg.php

/**
 * Enable SVG upload.
 */
function dwply_svgs_upload_mimes( $mimes = array() ) {
	// allow SVG file upload
	$mimes['svg'] = 'image/svg+xml';
	$mimes['svgz'] = 'image/svg+xml';

	return $mimes;
}
add_filter( 'upload_mimes', 'dwply_svgs_upload_mimes', 99 );

/**
 * Check Mime Types
 */
function dwply_svgs_upload_check( $checked, $file, $filename, $mimes ) {
	if ( ! $checked['type'] ) {
		$check_filetype		= wp_check_filetype( $filename, $mimes );
		$ext				= $check_filetype['ext'];
		$type				= $check_filetype['type'];
		$proper_filename	= $filename;

		if ( $type && 0 === strpos( $type, 'image/' ) && $ext !== 'svg' ) {
			$ext = $type = false;
		}

		$checked = compact( 'ext','type','proper_filename' );
	}
	return $checked;
}
add_filter( 'wp_check_filetype_and_ext', 'dwply_svgs_upload_check', 10, 4 );