Today in build 6.18 we introduced the ability to add attachments from Google Drive and Dropbox to GTDNext. Along with this feature we added the ability to add links (URL’s) to GTDNext.
Access to both of these features is via the Action Detail panel. You will see a paper clip icon that opens up a drop down menu as shown in the screen shot below.
The first time you choose Dropbox or Google Drive you will be asked to let GTDNext be authorized to access these two services.