text and pdf files help


Aug 6, 2012
hi, I have just got a new sony android tablet and have subscribed to a magazine. when I download the magazine I then want to safe it to my external memory card. when I do this it saves in text format rather than pdf. now I cant open the magazines to view them. any one know what I should do to fix this? I have tried researching how to change the files from text format to pdf but when I download these apps the text documents cannot be found on the system.
any advice would be great thanks!