To answer the question about why photos won’t post, I thought I’d show a few screen shots from my iPad.
When I click “Add File”, then select a photo, there is a selection at the bottom of that pop up that provides the option to resize the photo if the photo is a large size. Select “Choose image size”.
Then select a smaller size . I’ve been selecting “Medium” and the photos have loaded fine.
I hope this helps. I’m not an admin or expert......just trying to offer some help.
Lynne