File is not uploading via ZenodoApi --> ZenodoApiFiles --> upload() method

I am using this npm package to upload my files to zenodo bucket, I am getting 200 status code response while calling upload API( internally PUT API of zenodo)

Here is my code of reference

`const fs = require('fs');
const zenedo = require("zenodo");
const api = new zenedo({
token: '',
protocol: 'https',
host: 'sandbox.zenodo.org',
pathPrefix: '/api/'
});
async function uploadToZenodo() {
const fs = require('fs').promises;
const base64String = await fs.readFile('/home/user/Desktop/data/testFile.pdf', {encoding: 'base64'});
//console.log(base64String);
try{
api.files.upload({
bucketId: '',
filename: 'newFileName.pdf',
data: 'data:image/pdf;base64,' + base64String
}).then(function (response) {
console.log("response is coming for upload file :", response.data);
}, (err)=> {
console.log("Error while uploading file :", err.response);
});
} catch (e) {
console.log("Exception while uploading file :", e);
}
}

I tried all the formats but it's not uploading file content.

Start with the ZenodoApiFiles.upload() method and compare its handling of the provided base64 PDF data with the uploadToZenodo example. Confirm the expected data value and content type, then verify that an uploaded PDF can be viewed or downloaded with its contents intact.

Written by the indexing model from the issue text.