The answer it showed was exactly the answer that I gave. But it said that I was wrong.
If a child says uh-oh, it sounds like an okina is in the middle. To type it would look like u'o
The linguistic term is actually a glottal stop which English actually has, depending on the speaker
Earlier, if someone used an apostrophe instead of an 'okina DLHawaiian disallowed it, but I think they figured out some platforms don't have an easy way to type 'okina for those who want to try not using the word tiles, so it seems that they accept apostrophes now (thanks DL)