OK, I played enough to know how to use casting to Chromecast from iOS (iPad or iPhone). It is a little weird. Some of the people in my ward will be confused but I'll work them through it.
sbradshaw wrote:... as a workaround, you can turn on cast from any of the other screens (like the list of presentations)...
The cast button only appears when viewing an item on the device. It does not appear on the list of presentations or on the list of items in a single presentation. You have to open one of the presentation items, as if to add a note. When that one item is open, the cast icon appears in the upper right.
When you hit the cast icon and select the cast destination, the item you were viewing will cast to the TV. But, it is not in presentation mode at this point, it is only casting the one item
So, close the one item to return to the list of items in your one presentation. Now
click the presentation start button and the presentation will cast to the TV in presentation mode.
sbradshaw wrote:... Initiating cast while in presentation mode would be a good suggestion to send as feedback (Settings > Send Feedback).
Yes, I will send feedback about this clunky way of casting.
Thanks for the help!