Is it possible to import a CSV of watched movies/shows? If so, what are the specifications for the fields?
A few years ago, when I started using Trakt, I imported a csv of all my watched movies (from IMDb) and watched series (from SideReel) using this app: Watcht (link to app store)
It’s only available for iOS, but the process was very simple. I found out about it in Reddit, in this thread.
Hope this helps!