eSignature Drag & Drop to Upload Documents

I think it would be very useful to apply a Drag & Drop function to the Upload Documents button on the eSignature page. Currently, if you've got a file stored somewhere on your computer, using the file explorer to locate and select for upload at the very least adds an additional step to the eSignature process, and at worst can make it much more difficult to upload files if they're not stored in a typical file location.