Kindly introduce a "file scan" feature or whatever you may want to call it that allows users to scan all the PDF files available on the device, both external and internal memories included, and read any PDF file which they desire to read or work with, from the list of all the PDF files which the Acrobat reader shows them, after entering the said command, rather than having to go looking for every single PDF file one by one on the device and then opening those with the Adobe Acrobat reader. Thank you.