I've a rooted Sony reader PRS-T1 (based on Android 2.2) and usually when I need to copy files to it, I connect it to my laptop with a USB cable. However, sometimes I travel without my laptop and have only my phone/tablet. I tried using an OTG cable, but my phone does not seem to be able to read the reader storage. Is there a way of transfering files to my reader from my phone without using an external sd-card? In the past I used to connect to Dropbox in the reader's browser to download files or send the files thorugh gmail, but the browser is very old and this is no longer possible.