Displaying signature previously captured

When using the signature element, what form do you return the base 64 code to the model, to have a previously captured signature display? I allow users to save progress and don’t want them to have to sign again. I’ve returned the base 64 with and without the first part of the string, “data:image/png;base64,”. Neither method worked. Also, is there a calc I need to run on the BF side?

For something like this I would

  1. When returning or after the signature is captured render it as an inline img
  2. If they need to edit, a button that says edit and presents a new signature box