As the title says, I can’t find anything on the new style app apart from add to watchlist??
This is currently not available in the new Trakt V3 version.
Since you are on iOS, you can use Rippple or Watcht or any other iOS app that would sync with Trakt and support adding to collection/library.
Cheers for the info, will look into those suggestions 
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What was omitted from those suggestions is ironically that the devs for both those suggested items are employees of Trakt…
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