There are two ways to attach full text in EndNote. 

1. Use the Find Full Text function to search for articles and attach them automatically.  This process is not always successful as it depends on a variety of factors, but it will save you time when it works well. 
2. Manually attach files that you cannot find using the Find Full Text function

1. In EndNote, go to  Edit > Preferences (Windows) or go to EndNote 21 tab > Preferences (Mac)
    
2. In the EndNote Preferences box select Find Full Text from the left menu 
    
3. Copy the following URLs into the boxes:

OpenURL Path box:

https://jcu.primo.exlibrisgroup.com/openurl/61ARL_JCU/61ARL_JCU:JCU?

1. Select the reference(s) you want search
2. Click the Find Full Text icon 
3. When you use the Find Full Text function you may be asked to log in: Use your your JCU username (jc######) and normal JCU password
4. Click Continue (not Update)

Authentication does time out, so you may need to authenticate again at some point.

EndNote will attempt to locate the full text of the selected reference(s). You can see the progress and results of the search in the Find Full Text menu on the left.

This video from Charles Sturt University contains instructions on attaching and annotating PDFs manually:

1. Find and download the PDF file you want to attach
2. Right-click in the File Attachments field and select File Attachments > Attach File...