Derrick,
Another thought, when you are testing this, are you clicking the “Next” button after doing the Signature? The Next button is where “Save All App Data” is happening, so if you are not hitting that, potentially that would explain why it is not saving the signature to the Record History Widget.
As a side note, it is best practice to only have either the e-sig widget OR a Next button on the same step, not both. You can use one or the other combined with data validation features we just dropped in Release 274 - March 2024 !