Signature Capture endpoint is not making svg in the database

const payload = {
    data: JSON.stringify(,
    internal_name: data.internal_name,
    text: data.text,
    svg: data.svg
let response: any = await`${BASE_URL}/documents/${document_id}/signature_captures/`, payload);

This code still creates a signature capture however when I look at database it has no svg file. The svg value is a base64 value yet it is not storing…

The other signature captures are created through the edms. The other 2 is from my axios request