What are the options for correcting 'incorrect' signatures after the first signer has signed?

I am about to send out a multiparty agreement with some 50+ signers. Some of these will sign jointly for one legal anetity, some of these will be signing on behalf of multiple entities, and some of these will be adding their official company stamps to their signatures.

Having not done this before, I see the potential for things to go wrong somewhere along the way, and I don't look forward to cancelling the entire agreement process and starting over because signer 48 accidentally uploaded the wrong company stamp image file. What are the options for correcting signer errors?

- If somebody uploads the wrong stamp image, can I ask them to replace it during the signature process?

- If somebody signs on the wrong line (e.g. the CFO signs on the CEO line or vice versa), can I delte their signature and ask them to re-sign?

- If the company gets back to me in the middle of the process and says that they've fired their CFO and want the CEO to sign instead, can I delte the CFO signature and add the CEO as a signer?

- If somebody screws up in some other way, can I roll back to an earlier version, or do I have to start from scratch?

Thanks.