Before uploading, you must select a study from the breadcrumb menu (country and site are optional) and a TMF Reference Model folder for an artifact or reference model subtype.  These selections determine the document type to associate with the documents you upload.

Once you select a folder that allows you to upload, one or more upload locations (i.e., drop zones) are displayed in the middle of the page. In addition, if there are any existing study items associated with the selected level and folder, the study items are displayed below the drop zones. You can upload to either of these locations.