I was able to get this to work by placing your movies on the InDesign page and opening the Timing panel. Select a movie, then enable the "open page load" checkbox in the Media panel. Repeat this for all movies. Now, in the Timing panel, select all of the movies listed by Shift-clicking to select them all, then click on the link button at the bottom of the Timing panel to instruct them to play at the same time. I previewed this in the SWF Preview pane and I exported it to SWF and it worked as expected.
I always feel compelled to ask WHY one is doing this. Not three videos at
once, using SWF.
It has a very limited use at this point, something, apparently, that many
users are still unaware of.
I agree Bob, but I also know that there are a lot of (older) systems out there still using .swf as their distribution format. Can R. Sinclair elaborate on how this is being used?
Yup. Just don't like seeing people waste their time when they promised something to a client that will run on all devices or for a web project.
Totally agree Bob.
Thanks Bob. The key I was missing was to also check the "Play Together" icon in the Timing palette.
Once I got it working, however, I ran into another issue that seems to be a known bug: if your Page has a Transition (mine are all set to Fade), then any items on the Page that have an Animation (mine use Fly in from Bottom or Left) flash onscreen first before animating on, which of course ruins the effect. I ended up having to remove any Transitions from pages with Animations, which is disappointing. This was a note mentioned in Adobe's own documentation, but if anyone knows a way around this I'd love to hear it.