**retitled merged post originally titled: N7/Android newbie first impression: it's a kludge**
Well, I've had my Nexus 7 for 2 days now. Its my first Android device. I have a lengthy computer background, dating back to writing BASIC programs for my TRS-80 Model I in 1978, I ran my own BBS in the early '80s, was de facto DEC PDP 11-750 and MicroVAX-II SYSOP for my district office, and a national computer expert for a 10,000 person federal agency.
My first impression of Android is it's a designed-by-committee kludge. I bought it to save money, but I'm learning that I'll pay for it in time. Take a couple of simple tasks, like sending a photo to my tablet, and using that photo as my wallpaper. Then get a screen capture of my N7 with the new wallpaper, and post it to a forum in 600 pixel maximum resolution.
I can't hook up a memory card reader to the mini-USB port of the N7. Unlike some other Android tablets, it doesn't have a micro SD card slot, and its mini-USB port doesn't support OTG USB hosting.
So, I have to download my picture from the Internet, or send it as an attachment to my tablet, where it resides in my (invisible) download directory. I can't make that photo my N7's wallpaper until I move it to my Gallery, and I can't do that until I install software (ES File Explorer) allowing me to do this.
I could also send files directly to my N7's wallpaper directory using another file transfer program (WiFi File Transfer) that I had to download and install.
One other way to get a photo into my N7's Gallery is to change my Google + account's profile photo from my laptop or desktop computer. That puts the profile photo into my N7 the first time I log into Google +.
OK. Once I get the photo into my Gallery, I touch the screen, and (in Android 4.1) a message pops up letting me choose wallpaper from three icons - Gallery, Live Wallpaper, and Wallpaper. I choose Wallpaper, choose my photo, and get a framing box. If my photo is too large or too small, or low resolution to fit in the framing box, I have to get a different photo into my Gallery. Repeat as necessary.
The next step is to get a screen capture. I look up screen capture apps, and discover most are specific to a specific family of devices, using specific Android OSes. Great if you're using a Samsung Galaxy Tablet, or a rooted tablet, but not so great if your N7 just hit the market with a new 4.1 OS. I found an app that claimed compatibility with my N7. When I tried to run it, it stopped with an "incompatible" pop-up window.
All was not lost. I learned Android 4.1 has a screen capture feature that's activated by pressing the power and volume down buttons simultaneously.
I succeeded in capturing my screen with new wallpaper, and tried to post it as an attachment. It didn't work, because Android 4.1, hereafter referred to as Jelly Bean, or JB, only lets me choose attachments from my Gallery. I had to move my screen capture file from the download directory to my Gallery.
I decided to move the screen capture file to my laptop using WiFi File Transfer. I posted it to the forum from my laptop. The file size was the original 1280X800 pixel size, in png format.
I'd have to download yet another Android app to resize the screen capture photo to 600X375 pixel resolution. I did it on my laptop. It was easier that way.