Different types of dragging
In the methods described in Creating a Thought with an Existing File Attached, dragging created shortcuts in your Brain pointed to the location of the file in its folder. Dragging didn't actually move the file into PersonalBrain. You can tell that a shortcut has been created by the small arrow in the lower left of the icon (see above). If you want to move the file itself into your Brain, you have two options:
If you hold down CTRL as you drop the file in the plex, you will leave the file in its folder and make a copy in your Brain. This method uses the most disk space since multiple copies of the same file will exist.
To move the file out of its folder and into your Brain, hold down SHIFT while dropping the file into the plex.
The same rules apply to folders you drag into your Brain.
You can also attach a shortcut to the active thought by using the Select Content dialog box:
Display the Select Content dialog box by activating and clicking a thought that doesn't have content.
Click the ‘Create Shortcut to File button'.
Find the file to which you want to create the shortcut.
Click OK.
The shortcut icon appears to the left of the thought's name.