What are Notebooks?
Notebooks are documents where you can write formatted content on a project.
You can use Notebooks to keep notes on a project, store login details or project information.
The Notebooks feature works like a simple Word Processor. It is not intended to contain user pasted HTML code or as a HTML Editor replacement.
If you need to upload your own HTML styled documents, you may be better to upload them as HTML files in the Files section of your Teamwork project.
Why not create a notebook to store information such as your Projects Charter, SOW, Comms Plan, Risk plan, Stakeholder register etc.