You can attach files to your tasks from:

If you are using a 3rd party service, be sure that the files you want to link are accessible by your team members (allowing them access from the selected provider).

For linking a file, go to the Task detail panel, and click the "+" button on the right side of the files section. Select the desired service and follow the steps.

To remove a file linked to a task, just click the trash icon next to it. 

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