Uh how do you get a little blue box in a sandwich
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False. a placeholder can hold everything
Answer:
It could be because you where hack. Or there was something wrong with the site that stopped it from saying why it stopped.
Answer:
I am not for sure on this, but yes I think it is possible for the PowerPoint user to add notes to slides and see the added comments. If it isn't possible I know for a fact on Google slides it is possible.
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hope this helps! :)