Participants Signature not autosaving on partially complete e-sign document.

Hello,

I'm attempting to create a E-sign template that can be sent to 2-3 participants to fill out over the course of a month. An issue I'm ecountering though, is that the signatures are not being saved inbetween each session, where as text and other data are. Is there anyway for signatures to be autosaved after only partially filling out an e-sign document?

Thanks for the help!