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Written by myself

var blob = new Blob([this.response], { type: " text/plain" });
            var xhr1 = new XMLHttpRequest();
            xhr1.open("POST", url, true);
            xhr1.onreadystatechange = function (e) {
                
            };
            var formData = new FormData();
            formData.append("File", blob, fileName);
            formData.append("MarketPlace", "");
            formData.append("SignInEmail", "");
            formData.append("RequestDate","");
            xhr1.send(formData);

https://developer.mozilla.org...

I also thought about it (unfortunately not) and looked at the picture on Baidu (this is for java but the idea is the same, which is to use ajax to do the submit operation of the form. In this way, in the background or get a $ _FILE global variable. . I won’t post the details) (The original link is below)

Hope it helps you. Thank you