For each list slide, do the following:
If you don't see the mouse icons, right-click on any animation in the list and "Hide Advanced Timeline".
Make sure the duration for the title or list is not too fast, at least 1 sec. If it's more than 1 second by default, you can just leave it.
Select all the pictures (click, SHIFT-click on them all) ...
...add any green animation to them.
Then with animations still highlighted, go to the ANIMATION toolbar and set Start for all pictures to "With Previous".
With the picture animations still highlighted, if you look at the ANIMATIONS tab, if the duration is only .5 seconds, that's super fast for pictures to come in. Slow it down by increasing the duration to 2 seconds.
Your animations should look like this - title and bullets with a mouse icon in front; pictures with nothing in front.
Change the order of the pictures so they come in with the matching bullet.
Repeat for the other pictures. Your animation list should look like this when you're done...
Your other slides should look the same, bullets with the mouse icon in front ("On Click"), and all pictures with nothing in front ("With Previous".