We Recommend: Nexus Photo Viewer Allows You to View JPEG Photos on a USB Flash Drive on the Nexus 7
If you own the Nexus 7 or any other Android 3.2+ device with that doesn’t supporting mounting external flash storage, you’re probably frustrated by the lack of support for the USB Flash drive or SD card. Now thanks to an app called Nexus Photo Viewer, you can view the JPEG photos from a stick or card on your Nexus 7 or other devices.
Google didn’t provide USB/SD card access on the Nexus series and this is already a tradition. Now there’s a workaround, that involves a USB OTG Cable ($1 on Amazon), a USB flash drive or USB SD card reader and SD card and the app you can download from the link below. Keep in mind that this method doesn’t involve rooting and the USB drive must be formatted as FAT16 or FAT32, not NTFS or extX. The app is available in version 2.0.3 and requires Android 3.2 and up.
It takes up just 184 k of storage and it’s totally free. From what feedback on Google Play Store I can say that the software works great and does exactly what it promises. The only problem is that you’ll have a thingie dangling from the bottom part of your Nexus 7… Anyway you can get the app from here.