Can't say I didn't try. I used mtp to mount the device and tried to copy the new jpg into Download directory, write failure. I did search net, found some instructions like download the new wallpaper to your PC and copy it into your Android device ... HOW? Every attempt to write into device, I tried internal memory and SD card, fails! Then I uploaded the file into a web server and downloaded it using web browser, all attempts to save it somewhere where I could use it failed. Yes, I'm new to Android tinkering, what I have seen so far does not make any sense to me. Why can't I just drop the file into Android using mtp and set it as a wallpaper?

The way I have always set the wallpaper was to download the image with the web browser by long pressing on the image and then choosing the save image option. I then go to my gallery app and find the picture, tap the menu button and choose use as... then I can set it as the wallpaper.

I use the firefox web browser in android and I just checked the image options there and you can actually "Set image as" directly from the long press menu.

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Thanks! It appears I didn't know how to save images in browser ...

The long press on Android is like using right click on the PC. Sometimes it's not obvious that you can long press for a popup menu, so if you are ever stuck try long pressing