cloud Sync files cannot be removed

So I upload three movies to dropbox to more easily access while traveling plus to learn the feature. Very cool!! In Plex itself I see NO WAY to remove movies once put onto the cloud. This forum said to simply go to dropbox and remove. So I did that for one of the 3 movies and connecting to Plex cloud on Roku (or anything) still shows the movie as there but of course it will not play falsely claiming an issue with transposing. Frankly speaking without a means to mange cloud content both to out on or remove from a sync cloud the feature is nearly useless.
If someone can advise me how to remove a movie once uploaded from inside Plex itself I would greatly appreciate it. I could remove the entire directory inside the plex app from Dropbox and start afresh if that is the thing to do as well.

Thanks in Advance!
Ron

Update! It’s worse than i thought. I removed the complete dropbox directory inside plex app and all the movies no long there simply remain in my plex sync cloud. So the feature is largely disabled if there is no way to remove from inside the plex server.
Help!!
Ron

It appears the thing to do is first go to server/devices and remove cloud sync entirely. Then go to dropbox or wherever and delete the entire plexapp directory. When it is desired to put something up re-initiate the cloud sync feature.
Clunky but functional…
Ron