ntozier Thanks for the reply. Wishing you a very Happy New Year.
I have updated the OSTicket to Latest Version. But Issue is still Same.
I'll explain the Issue again : When a Customer is attaching something first time while creating the Ticket his attachment is getting attached but when he is attaching again that attachment is not getting attached in the same ticket instead it is taking an image of the whole page and that is getting attached.
In the above Image you can see Test 1 image is attached by a Customer and Test 2 is by an Agent but When Customer is Attaching the Test 3 image then that image is not getting attached instead the whole page's image got attached as shown in the last image in above reply. Attaching the full image for further clarification. 