You need to be in view mode in order to add comments and attachments.

Select Comments and Attachments from the report toolbox list in the upper right corner to open Attachments panel.

Attachments dialog allows you to add:

Maximam attachment size is 20MB.

comments-attachments

Adding Comments in Table Cells

Hover over desired table cell and select comment to atach comment to the data.

Red triangle marks cells with attached comments. Hover over the cell to see the bubble with the comment.

cell-comments

Next Steps