One of the things I dislike about DocuSign is there’s no linkage to the document used to create the PDF you’re supposed to sign. I was once sent a DocuSign email by a large/seemingly reputable company, and I read through it to make sure it was what I expected. It wasn’t — they had edited a key provision, in a way that favored them.
Most people don’t read through DocuSigns, partly because the platform makes them difficult/impossible to word search. It would be great if every email from DocuSign included a Word doc of the agreement you’re being asked to sign. Otherwise the platform can be manipulated by unscrupulous people who take advantage of how hard it is to review documents on the platform.
You might be able to argue that you had not truly assented to the modified provision, using emails exchanged back and forth to show what the parties had agreed to prior to the DocuSign email. But it would be an uphill battle to prove this, so it’s always better to not have your signature on a document whose provisions you don’t agree with (IAAL).