Possible to play 2 or more videos automatically?

I've checked out various solutions to this problem of multiple videos not playing automatically (appended to one another without a break) but I can't get multiple videos to play in my old Keynote (6.2.2). So, a few questions:

Q1: Is it possible to play multiple videos automatically in my old Keynote?

Q2: If not, what about in newer versions of Keynote?

The problem is – there are lots of options that seem to interact and I don't understand how they interact. I would have thought I simply:

1. Drag in a series of videos (I can always get them to play individually)
2. Set the Document to Self Playing, with Delay set to 0, and Builds set to 0
3. Set Start Transition to Automatically, with Delay set to 0.

And it should play with no transitions, no delay, and everything auto. But it doesn't work. Amazing.