

I used Kodi for years (back before and during the XMBC - > Kodi shift) before moving to Plex, it was great (a pain for a good config, but once your clients have remote access and use a shared database its insane how good it can be) but Plex was touted for so long I figured I’d give it a try when I saw a good sale. I’ve been using it for the past 8 years or so but may go back to Kodi or Jellyfin.
I know you mentioned Nextcloud and if you happen to already be running it you can use the add-on/module/whatever called Secrets, its exactly what you describe. You make note, send link (can password protect if you want) and once its been viewed its gone.
If you don’t already have Nextcloud, check out vaultwarden’s (bitwarden) send feature.