How to get file buffer from file

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To answer your question on buffer, you do this:

const fetch = require('node-fetch'); //NPM package I like using but you can use wix-fetch

let buffer = await create_buffer(); //This is the buffer
let encoded_file = await encoder(buffer); //This is the base64 encoded result

const create_buffer = () => {
    return fetch(YOUR_URL, {
        method: 'GET',
        encoding: null
    })
    .then( (res) => {
        return res.buffer(); //This is the buffer
    });
}

const encoder = (string) => {
    var encryptedBytes = Buffer.from(string);
    var encoded = encryptedBytes.toString('base64');
    return encoded;
}

But you will not be able to directly upload a file without going thru the wix media manager natively, with custom html code or custom element you may be.