I'm trying to add ability to create custom forms with TinyMCE 4 but can't understand how to do it properly. I should create my custom plugin and then connect it to editor, but can't find any useful information. Tried answer from this thread Magento 2.3 - TinyMCE4 Toolbar and Plugin Configuration but i can't add my custom plugin by this way. Magento devdocs also don't give me any useful information.
you can use this https://github.com/pavelleonidov/magento2-tinymce4 and add this module to extend tinymce4 will work https://github.com/quannh02/tinimce4