Issue uploading files using k6-browser page.setInputFiles

Grafana k6 k6-browser
1

Hello!

I am opening the file I want to upload in the init

const fileForUpload = open('./files/skipped/meta-001.pdf', 'b');

My code with use of page.setInputFiles()

    await page.setInputFiles('input[class="dz-hidden-input"]', {
        name: 'meta-001.pdf',
        mimeType: 'application/octet-stream',
        buffer: fileForUpload,
    });

When the code runs I get the following error when the `page.setInputFiles()` step runs

INFO[0022] Error performing ui interactions: setting input files on "input[class=\"dz-hidden-input\"]": InvalidCharacterError: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
    at __xk6_browser_evaluation_script__:2056:39
    at Array.map (<anonymous>)
    at InjectedScript.setInputFiles (__xk6_browser_evaluation_script__:2055:30)
    at __xk6_browser_evaluation_script__:3:20  source=console

I have tried looking at documentation and researching other examples but I have had no luck getting this to work.

Anyone have any ideas?

k6 version info: k6 v1.4.2 (commit/5b725e8a6a, go1.25.4, linux/amd64)