Setion244 Cr.P.C. deals with pre-charge evidence in a complaint case.So documents given u/s Section 244 Cr.P.C do not come under defination of charge-sheet,which comes in picture as per provision of Section 245 Cr.P.C.Documents given in proceedings of 244 Cr.P.C. are part of evidence.As far your second chance is concerned it comes under Section 246 Cr.P.C, in which futher evidence can be submited by complainant side through a new witness, who had been not examined in Pre-Charge evidence.
Section 244, Cr. P.C. the accused has a right to cross-examine the witnesses and in the matter of Section 319, Cr.P.C. when a new accused is summoned, he would have similar right to cross-examine the witness examined during the inquiry afresh. Again, the witnesses would have to be re-heard and then there would be such a right. Merely presenting such witnesses for cross-examination would be of no consequence.
In Harinarayan G. Bajaj v. State of Maharashtra & Ors. (2010) 11 SCC 520, this Court reiterated the legal position stated in Ajoy Kumar Ghose (supra) and held that the right of an accused to cross-examine witnesses produced by the prosecution before framing of a charge against him was a valuable right. It was only through cross-examination that the accused could show to the Court that there was no need for a trial against him and that the denial of the right of cross-examination under Section 244 would amount to denial of an opportunity to the accused to show to the Magistrate that the allegations made against him were groundless and that there was no reason for framing a charge against him
In your case the photocopy is marked previously through Polygraph Expert and comparing the Photocopy filed on court record with his own records. So in this juncture defence counsel can not even challenge its authenticity