You are able to attach files that are stored in that workspace to specific tasks.
First, expand the task by clicking on the small grey arrow to the left of the task title:
After clicking the small grey arrow, in the bottom left corner, you will see a list of files already attached (if any) and a button which says ‘Add attachments’:
Clicking the ‘Add attachments’ button will open a file browser:
Select the file, or files, which you wish to add and click ‘Update’.
If there are more than 4 files attached then you will need to click the ‘View more’ button to see a full list of the files attached to the task: