function doPost(e) {

 const folderId = "###"; // Folder ID which is used for putting the file.



 const blob = Utilities.newBlob(

 JSON.parse(e.postData.contents),

 e.parameter.mimeType,

 e.parameter.filename

 );

 const file = DriveApp.getFolderById(folderId || "root").createFile(blob);

 const responseObj = {

 filename: file.getName(),

 fileId: file.getId(),

 fileUrl: file.getUrl(),

 };

 return ContentService.createTextOutput(

 JSON.stringify(responseObj)

 ).setMimeType(ContentService.MimeType.JSON);

}function doPost(e) {

 const folderId = "###"; // Folder ID which is used for putting the file.



 const blob = Utilities.newBlob(

 JSON.parse(e.postData.contents),

 e.parameter.mimeType,

 e.parameter.filename

 );

 const file = DriveApp.getFolderById(folderId || "root").createFile(blob);

 const responseObj = {

 filename: file.getName(),

 fileId: file.getId(),

 fileUrl: file.getUrl(),

 };

 return ContentService.createTextOutput(

 JSON.stringify(responseObj)

 ).setMimeType(ContentService.MimeType.JSON);

}

<form id="form">

 <input name="file" id="uploadfile" type="file" />

 <input id="submit" type="submit" />

</form>



<script>

 const form = document.getElementById("form");

 form.addEventListener("submit", (e) => {

 e.preventDefault();

 const file = form.file.files[0];

 const fr = new FileReader();

 fr.readAsArrayBuffer(file);

 fr.onload = (f) => {

 const url = "https://script.google.com/macros/s/###/exec"; // Please set the URL of Web Apps.



 const qs = new URLSearchParams({

 filename: file.name,

 mimeType: file.type,

 });

 fetch(`${url}?${qs}`, {

 method: "POST",

 body: JSON.stringify([...new Int8Array(f.target.result)]),

 })

 .then((res) => res.json())

 .then(console.log)

 .catch(console.log);

 };

 });

</script>