You can open the asset detail view:
By clicking on the attached asset in the task details.
By clicking on an asset in the asset explorer.
Opening the asset detail view of Portal snapshot assets will open the "Capture mode" of the snapshot.
The detail view shows all relevant information about the asset and is split into three areas:
The preview area, which allows you to navigate through assets and manipulate the preview.
The preview menu,
which allows you to open or close the sidebar, upload a new
version, download the currently
selected asset, add stamps,
and add markers to comments.
You can find additional actions in the "More actions 
" menu.
The sidebar,
which allows you to view the asset
information and add comments
to assets. You can show or hide the sidebar
with the 
icon in the preview menu.