https://pay.weixin.qq.com/wiki/doc/apiv3_partner/apis/chapter2_1_1.shtml
上传原图
Server error: `POST https://api.mch.weixin.qq.com/v3/merchant/media/upload` resulted in a `501 Not Implemented` response:\n<html>\r\n<head><title>501 Not Implemented</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>501 Not Implemented</h1></c (truncated...)\n
压缩之后上传
上传成功
图片有大小限制，不超过2M，文档上有说