You can view attachments added to an asset and upload a new attachment by selecting Attachments on the asset menu. Attachments can be, for example, text files, images or recordings. By tapping on an attachments name you can open a menu in which there are a few features you can use. By selecting Set default you can set a default image for the asset. The default image is shown, for example, on asset menu and on asset list.
Select Upload if you want to upload a new attachment. You can return to the asset menu by selecting Menu on the bottom of the view.