document.getElementById('multipartInputBtn').addEventListener('click', async () => {
	const multipartInput_fileInput = document.getElementById('multipartInput');
	const file = multipartInput_fileInput.files[0];
	const fileName = file.name;
	const fileSize = file.size;
	const url = `https://uniquestring.execute-api.ap-south-1.amazonaws.com/dev`;

	try {
		let res = await axios.post(`${url}/getUploadId`, { fileName: fileName });     // << here it shows the error
		const uploadId = res.data.uploadId;
		console.log(res);
		console.log('Inside uploadMultipartFile');
		const chunkSize = 100 * 1024 * 1024; // 100MiB
		const chunkCount = Math.floor(fileSize / chunkSize) + 1;
		console.log(`chunkCount: ${chunkCount}`);

		let multiUploadArray = [];

		for (let uploadCount = 1; uploadCount < chunkCount + 1; uploadCount++) {
			let start = (uploadCount - 1) * chunkSize;
			let end = uploadCount * chunkSize;
			let fileBlob = uploadCount < chunkCount ? file.slice(start, end) : file.slice(start);

			let getSignedUrlRes = await axios.post(`${url}/getUploadPart`, {
				fileName: fileName,
				partNumber: uploadCount,
				uploadId: uploadId
			});
			let preSignedUrl = getSignedUrlRes.data.preSignedUrl;
			console.log(`preSignedUrl ${uploadCount} : ${preSignedUrl}`);
			console.log(fileBlob);
			// Start sending files to S3 part by part

			let uploadChunck = await axios.put(presignedUrl, fileBlob)   // << here it shows the error
			console.log(uploadChunck)
			

		}
		
	} catch (err) {
		console.log(err, err.stack);
	}
});