Signature field missing "Save to Assets" option and rendering as Base64 in custom templates

[DianyelaMaldonado]

Describe the bug

I am trying to use the Signature field in a custom Email and PDF template.

Current behavior:

1. The "Save to Assets" setting is missing from the Signature field configuration (General/Advanced settings).
2. Because I cannot save the signature as an asset, {{ submission.getFieldValue('signatureField').one() }} returns null.
3. The field value defaults to a Base64 string, which renders as raw text in my templates unless I manually wrap it in an <img> tag.

Expected behavior:
I should be able to save the signature as an asset to handle it as a standard Craft Asset in my Twig templates.

Steps to reproduce

1. Create a new form in Formie.
2. Add a "Signature" field.
3. Navigate to the field settings (General, Settings, and Advanced tabs).
4. Observe that the "Save to Assets" toggle is missing.
5. Submit the form and check the contentHtml in a custom email; the signature appears as a Base64 string.

Form settings

• Field Type: Signature
• Logic: No conditional logic enabled.
• Template: Custom Email and PDF templates using form.getFields() loop.

Craft CMS version

5.8.22

Plugin version

3.1.6

Multi-site?

No

Additional context

[engram-design]

Signatures aren't assets, that's probably the thing. They are stored as base64 strings as you've discovered. They can't be attached to email notifications as an asset.

Using an <img> HTML element is exactly the way to go, it's what Formie does.

I'm not sure if you're using custom templates or something, but it (by default) shouldn't be showing the raw base64 string of the signature like that. Just let me know if you're doing something unique about your templates, or what that looks like.

Additionally, we decidedly don't want to store signatures as assets, mostly because of their sensitive nature. At least with Formie's approach, they're slightly more difficult to download, as opposed to a folder in your assets with everyone's signature as a file to download.