Hello Johnktejik,

I was able to update the content-type with the following code below.
 

const axios = require('axios');
const FormData = require('form-data');
const fs = require('fs');

// Create a FormData object
const formData = new FormData();
formData.append('file', fs.createReadStream('/file/path'), {
    contentType: 'x-application/vnd.lucid.standardImport'
}); // Adjust file path
formData.append('product', 'lucidchart'); // Product name


// Send the request
axios.post('https://api.lucid.app/documents', formData, {
    headers: {
        'Authorization': 'Bearer <oauth token or api key>',
		'Lucid-Api-Version': '1',
        ...formData.getHeaders(),      
    },
})
.then(response => {
    console.log('File uploaded successfully:', response.data);
})
.catch(error => {
    console.error('Error uploading file:', error);
});