Add (existing)
Adds an existing document to an existing project
Button: 
Command name: AddDocument
- Click on the Add (existing) button.
- In the file selection dialogue, select the file type of the file you want to add to the project from the drop-down menu at the bottom right.
- Navigate to the storage location of the document.
- Select the file.
- Click on Open.
The document is added to the project in the selected folder.
