Trello create card attachment error: 'File too large' with 8kb image

Attempting to use Trello's Create card attachment with a 8kb PNG file, I am getting a 'File too large' error in return.

code sample:

    const image = await sharp(
      "path/qrcode.png"
    )
      .resize(200, 200)
      .webp({ quality: 20 })
      .toFormat("png")
      .toBuffer();

    // * CREATE NEW CARD WITH LIST ID
    await axios
      .post(
        `https://api.trello.com/1/cards?idList={LISTKEYHERE}&key=${TRELLO_KEY}&token=${TRELLO_TOKEN}`,
        {
          name: "Create new card",
          pos: "top",
        }
      )
      .then((res) => {
        const id: any = res.data.id;

        axios.post(
          `https://api.trello.com/1/cards/${id}/attachments?key=${TRELLO_KEY}&token=${TRELLO_TOKEN}`,
          { file: image }
        );
      });

I've read from other injuries that the free version of trello allows a 10mb upload for attachments, the image being 8kb should be well under that limit.

I also tested to see if the front end of trello boards allows the image to be manually attached, the same file works fine from the UI end.

Notes: Instead of making the separate call for creating an attachment, I also attempted the key value parameters for the initial call for creating a card's (fileSource) as well. Same error.