I think we can add a feature where we can view attachments from all notes in a single window, making it easy to browse them and find just the one we want.
I know Joplin-devs are busy right now fixing some bugs and for GSOC. But for the future this feature would solve a good number of problems like people not able to find their notes easily using Global Search as they probably don't know how to operate it. But this GUI feature will enable them to find just the note they want easily as humans remember visuals more. 
We can categorise the component in the following ways:
What say?