AddingSignature

Hi Team, 

We have a requirement such that, when a document is sent for signature and signer opens it for the sign then signer will get a provision to select the Signature method of his choice. It can be a dropdown (or anything that will allow signer to make selection) including all signing methods -

• Click-to-Sign

• Capture Signature

• Mobile Signature

• Click-to-Initial

Something like below : 

HI Team,

How can we allow a particular signer to upload a signature file into the agreement?

I know how to do it from UI but need to do it using salesforce apex code. Right now we are just adding the role as below.