I have enabled Blockquote to appear in the toolbar in appsettings-schema.json as follows:

"UmbracoCmsCoreConfigurationModelsRichTextEditorSettings": {
      "type": "object",
      "properties": {
        "Commands": {
          "type": "array",
          "description": "HTML RichText Editor TinyMCE Commands.\n            ",
          "items": {
            "$ref": "#/definitions/UmbracoCmsCoreConfigurationModelsRichTextEditorCommand"
          },
          "default": [ "blockquote" ] // Add "blockquote" to the array
        },

But it gets wiped out on build?

You can do that in appsettings.json

"RichTextEditor": {
        "Commands": [
          {
            "Alias": "blockquote",
            "Name": "Quote",
            "Mode": "Selection"
          }
        ],

Ahh thank @huwred doh!

Odd, worked for me

It may be where it's placed, it's a client site and has a lot of customisation. I'll ask thier devs, thank you.

No longer works in 14 🙁 although blockquote is there by default, adding other plugins doesn't work. I usually add

"Commands": [
          {
            "Alias": "codesample",
            "Name": "Code Sample",
            "Mode": "Insert"
          }
        ],
        "Plugins": [
          "codesample"
        ],

I think they moved the config to the frontend rather than in dotnet for v14? Can't remember for sure, but I think I remember reading that somewhere

Yes, you have to use a manifest file now, but can't get that to work either 🤣

Oh weird, that's annoyingh

well, I figured out how to add it, but it is not very usable 🤣 the layout of the popup make selecting the code language impossible. Manifest code below

{
  "name": "My TinyMCE Plugin",
  "version": "1.0.0",
  "extensions": [
    {
      "type": "tinyMcePlugin",
      "alias": "mytinymceplugin",
      "name": "My TinyMCE Plugin",
      "meta": {
        "config": {
          "plugins": [
            "codesample"
          ]
        },
        "toolbar": [
          {
            "alias": "codesample",
            "label": "Code sample",
            "icon": "code-sample"
          }
        ]
      }
    }
  ]
}