Missing buttons in the TinyMCE toolbar affect html fields


HTML type field is not showing some buttons as part of the TinyMCE toolbar. Also if the image button is not displayed, then images won't be displayed in the HTML field. 


Review if the following system properties exist in your instance:


Those properties customize the TinyMCE toolbar for all HTML fields, so please update them based on your requirements.

For more information, please review:
Customize TinyMCE attributes