I came here to say this. Works in browsers, phones, everywhere. Can create complex passwords for you. Data is (supposedly) encrypted by you, but stored on their servers so if you forget your master pwd, you have to reset your data. I've been using it for a few years now and I love it.

I used plex for like a decade. I loved it. It had all the features i would ever need. A year ago i tried out an open source media server called Jellyfin and was blown away. It was so easy i started digitizing my library again. I use makemkv to backup the bluerays (it handles multiple audio streams too), and handbrake to reencode them to a streaming format. If you encode the movies into a streaming format, there's mo need to re-encode when serving them, thereby saving a lot of provessing.