Insert Quote variables into Email Templates

Hi, I'm trying to insert fields from the Quotes module into an Email Template. 

Sugar version is "SugarCRM Version 11.0.0 (Build 238 P) (Q2 2021)"

I have found a few forum posts that relate to this. The most popular post seems to be this one:

However this is a few years old and is missing some images that might prove useful. Although I have followed the instructions as best I could, I still do not have the Quote module available in the Insert Variable section of the Template. 

If anyone has some instructions of more information, I would greatly appreciate you help.