BTS, Extras, Other Folders Not Loading

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I would say it's likely due to the fact that your naming scheme is all over the place at the moment. Jellyfin's parser uses folder names ("Series Name (YEAR)") and filenames as clues. Your folder is rick-and-morty while your episode names don't even match that nomenclature.

Pick a small segment (maybe one season) and rename to match the spec. Files, folders, all of it. If that resolves the issue, you've found the culprit. Then you can decide what you want to do next. There are tools that can help.