You can collaborate with your team members by adding comments to any task. Comments will appear at the bottom of each task in the List and Board view, or in the Info column on the Plan view if the task is in a project.
To add a comment on the List or Board view, go to the bottom of the Task, enter your comment, and click Add.
When new comments have been added by your other team members, the comment icon in the List or on the card in the Board will be green until you have read the comment. New comments will also send an email to team members assigned to that task.
You can add one or multiple files to a particular task. These Files can be accessed from the files section a task in the List or Board, or on the Files page for the project. On a task in the Board or List, select "+ Files" and select the file or files to upload.