Evidence by way of affidavit

Your questions seeking clarifications involve practical situation which your advocate will be able to guide you properly and it is presumed that you have engaged the services of an advocate because you have asked too many questions without even understanding what actually you want to clarify.

However, if you have already testified yourself as witness and marked the documents as exhibits and if you want to add additional documents you may have to file a petition to recall yourself  for filing additional documents for the reasons you may have to state in your petition accordingly.

If some of the original documents are very vital which you cannot spare to file them in court then you can bring those original along with the photocopies of the said documents, get it compared and file the photocopies before the court with the leave of the court. 

You may better be in touch with your advocate on all such further issues so that you don't mess up things without knowing the procedures of law. 

What type of case? In which Court? 

To my knowledge, evidence through affidavit could be filed only with the permission of the Court unless so privided by the Statute.

Take help of local lawyer for proper legal guidance. 

Affidavit of evidence can /shall not be asked or submitted at the time of filing petition and commencement of trial in a family court, as stated by you.

Prima facie your facts vis-a-vis queries are premature and hypothetical.  However, if these are true facts, seek opinion and advise of your lawyer, if you have not lost your faith in him/ her (your lawyer).