Thanks for the useful information. My last question (for now!) is: We're going to be traveling with an iPad. I would like to be able to create slideshows using the iPad. I don't think the WordPress app supports that function, and there are also problems with the app that need to be worked out. If you go to the WordPress Website using a Bbrowser to do a post with the iPad, you can't get at the images on your iPad because they're part of the Photos app, and the WordPress media uploader doesn't recognize them.
I've used another app, Blogpress, which works well for getting images posted. I then have tried going to my Blog through the WordPress website to edit the post and add a slideshow. The process looks like it is working the same as when I do it on my desktop computer, but when I view my post, it only shows the static images, not a slideshow.
If anyone knows if I'm doing something wrong or if there is a workaround, I would appreciate hearing about it.