I added Youtube plugin in CKEditor and according to instruction on page added the code in config.js but it did not show the youtube insert button on toolbar.
I downloaded and extracted the Youtube plugin to folder and the added following code to config.js
config.extraPlugins = "plugin1,plugin2,youtube";
but it did not show in toolbar. I added the it in items in toolbar also like
{ name: 'styles', items: [ 'Styles', 'Format','youtube' ] }
But insert button did not appear in toolbar.
Blockquote
I had to use capital letter 'Y' as Youtube when adding it to toolbar like:
{ name: 'styles', items: [ 'Styles', 'Format', 'Youtube'] }
and "y" small letter 'y' as youtube when adding in extraPlugins
config.extraPlugins = "plugin1,plugin2,youtube";
not sure why its missing in instructions given on plugin page but this is how it worked for me.