Why email PDF is not updating?

I am having a similar issue to the thread here: https://www.jotform.com/answers/438556-Edit-submission-The-PDF-uploaded-to-dropbox-does-not-display-the-edited-data-

After a submission is edited, the notification email is sent again, but the attached PDF has not updated with the new information - particularly signatures in the widgets used. As the form is long, I thought it might be due to the length of the form/application, and if so, I'd like to know what determines this so I can adjust appropriately.

I did a test submission and Edited afterward but I couldn't replicate this issue. Upon submission of the edited form I received it normally:

If you had something else in mind, please let us know.

We'll wait for your response.

Thank you!