Log in to the HTML5 client.
Select the Documents tab available in:
The Administration workspace, if documents are managed at the Project level.
The Work Package Work management workspace, if documents are managed at the Work Package level.
Select a Project or a Work Package in the selector.
Click on the New (
) button.
In the New Document popup, choose your selected file and click on the UPLOAD button.
The new document is added to the spreadsheet.
Modify the attributes if necessary.