Add attachments - files
Using Mac OS the current facility to Add Attachments does not seem to allow importing of files into a thought, only the short cut. A file can be imported by dragging the file name from a folder but not as an option to the Add Attachments route.
In addition when dragging files what is being dragged is not always consistent sometimes it indicates a shortcut and sometimes not.
On this same option the Link to File Box brings up the folders/files screen for file selection and offers the Open selection box - other options say Choose which is the more appropriate term.
This is not Mac OS specific. After you have added a link to the file, right-click it and select “move file into brain”