Hello Alex,
The Survey Guide that is can be linked to the survey through the survey files functionality ( in the "general" tab of the Survey Designer Designer) :
![alt text][1]
Once the PDF file is added to the survey adn and you export it to Collect Mobile it can be seen in the app menu:
![alt text][2]
If you add the survey guide PDF to a Collect Earth survey you can see it from the Help Menu!
![alt text][3]
[1]: http://www.openforis.org/support/upfiles/chrome_2019-05-02_15-18-25.png
[2]: http://www.openforis.org/support/upfiles/Screenshot_20190502_134632_org.openforis.collect.jpg
[3]: http://www.openforis.org/support/upfiles/javaw_2019-05-02_15-17-26.png