After playing with the free version for an hour, I found that:
1. The option to search for posts by name did not work.
2. 16 posts are displayed for selection. No more. So browsing did not work.
3. The option to select posts by tag sounded really great. I added the “featured” tag to the posts I wanted to included, and selected that option. But nothing happened.
4. It THEN became clear that 1) You select category or tag, and then click [Search] to see the posts. You then select the posts you want and click [Add to Slider].
(I doubt I’m the first to run into that problem. I suggested adding help-text to the Add Posts popup, to improve usability.)
5. Only posts with a featured image were displayed. That option was over in the settings page. (But where it needs to be is in the dialog, so you know what’s happening.)
After figuring all that out, I thought I had a winner. Alas! It was not to be.
1. Space for a featured image is always allocated, even if the post doesn’t have one.
(You you see a gray box for those, that you can’t eliminate.)
2. There is no option that says, “don’t display an image”.
3. The teaser-text for the post appears over the image (or the gray box), which is pretty unsightly.
All in all, this plugin came very close. Perhaps there were some settings options that could have eliminated the overwriting. (Or perhaps the overwrite was due to the Invicta theme I’m using.)
If there were a solution, it might make sense to go find images for the 7 posts I want to feature that don’t currently have them…