Adding files to a review process

[Supply5F9B]

Hello, fairly new to Adobe Sign.  We send out documents to get signed and then they come back to me to review.  Is there an option in Adobe Sign that I can add a file during my review process or does that need to be set up when sending out the document?

Also, when we send out documents that need a file attached, is there an option for the signer not to sign unless he/she has the attachment attached?

Thanks.

RS