魅族16无法保存图片

操作系统:Android 8.1.0 (魅族 16th/Flyme 7.1.1.1A/App6.31/v20006310)

WebView:Mozilla/5.0 (Linux; Android 8.1.0; 16th Build/OPM1.171019.026; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/65.0.3325.109 Mobile Safari/537.36