请教 webhook api 调用百度智能云ocr 报错的问题

Web hook url: https://aip.baidubce.com/rest/2.0/solution/v1/iocr/recognise?access_token=24.1fc9d92906876f7b9bc599e5c73ece5b.2592000.1630892590.282335-24660552&classifierId=112476bc8a223de81ab1fd9f2d0baa2d&image =附件表单 报错信息： error_msg 文本框 image size error,image is too big or too small, upper limit 4M, lower limit 1k,please check your param 请教下各位，帮查找下错误。谢谢。