When you say “canvas” do you mean the file:
contact-form-7-signature-addon/signature.php
If so, my canvas is currently set to:
<canvas id=”wpcf7_%4$s_signature” class=”%4$s” width=”%5$s” height=”%6$s”></canvas>
Or, do you mean we have to put the code in the actual form:
[signature* signature-838]