Kingsly - as an "anonymous" user; the general public will not be able to edit their original entries or attach their documents to existing records without the permissions to see everyone else's records. John - you will need to either have them submit their documents; entering key information about themselves (such as an email address) on each record so that you can "connect" the documents to their original resume entry more easily.
There are some solutions you could opt to build into your candidates table which might be able to offer you a solution; but they would be better discussed 1-on-1.
