Submitting a .pdf after saving

Hi,

I have a .pdf form created in Acrobat pro DC which has a javascript to submit the form at the end.  This all works if there is internet (the users have DC reader).  If there isn't a connection to the internet available then the operator saves the file locally.  When they have internet again they open the file to submit it but the button is no longer active?  I have spent ages trying to work this one out but can't find out how to do it.

Anyone have any ideas?

Thank you