The term ‘Doc’ listed here corresponds to ‘copyright’. In general, after you submit your copyright for US Visa renewal using dropbox you might occasionally see this area as blank. Down below are a number of the widespread reasons. আরো পড়ুনঃ ই পাসপোর্ট যে যে জেলায় চালু হয়েছে (সর্বশেষ আপডেট) বাচ্চাদের https://youtu.be/4vWsUtsjmTI