Yes, but what if you don't have a computer handy or free? Would getting a Memory Card Reader, plugging it into the OTG cable, and plugging that into the N7 do the trick? Is the software in place such that the N7 knows what to do next?
Along with the OTG dongle, and your card read, you'll need to get Nexus Media Importer (NMI) for this to work. I just got my N7 last week, mainly to view photos while I'm traveling (and not often connected to the Internet).
NMI cost a few bucks but I think it's worth it. Works really well. Only thing is, you might want to also get some kind of file manager app (I have X-plore) so you can create folders for your images. And then you can direct NMI which folder you want to copy your images to. The Android file structure is a bit odd to me (not being a techie, and coming from using Windows XP), but I've been able to find my way around in it. Just remember to create your folders and copy your files to the (sdcard) directory, not the (root) directory.
I usually put my image files in a folder, something like: (sdcard)/storage/emulated/0/Pictures/my-folder/
I also downloaded the app Photo Editor (by dev.macgyver). I haven't learned too much about image editing with it, but it does have a Batch function, so I can resize my JPG files, making them smaller so they take up less space on my tablet. I will be keeping the original JPGs and the raw files on my SD cards, so I really only want to view and maybe do some light editing while traveling, so don't need really big files. Once I've done the batch conversion (PE puts the files in an odd place, and can't remember right now where that is), I delete the original big files and replace them with the smaller ones.
Finally, besides Photo Editor, I have Snapseed (free app, owned by Google), which I haven't played with too much; and I also got Photoshop Touch ($10), which I've been doing most of my editing on--it's working out well, once I've figured out how to use it.
Hope that is helpful, and not "too much information."
Regards, David