Organizing different video resolutions

I have 3 different resolutions auf a video 720 288 540.
Following manual I copied it to a folder videoname and named it videoname - 720p.mp4 videoname - 288p.mp4 videoname - 540p.mp4 .
It is still shown as 3 videos in the plex app first without 720p others with 288 and 540, also tried 240 and 480, does not help, how can I make it show only once and then choose fitting resolution automatically or manually?

Is this an ‘Other Videos’ library?
Make sure the embedded title meta tag of these files is identical.

You can mark all 3 of these items and then ‘merge’ them.
https://support.plex.tv/hc/en-us/articles/201018248-Merge-or-Split-Items