A few polish items to ensure a smooth UX:
 
General

• Rename app tile to "Assets" instead of "DAM“ (maybe add "NEW" for interim purpose)
• Hide the first browser app (where currently all DAMS are combined / read only)
• Show all DAMS separately in isolated sub apps with their according actions
• Use the Assets icon instead of the JCR icon for all tabs 
• Make sure the green app icon for Assets always shows on the first tab

Magnolia Assets

• Rename tab name from JCR assets to "Magnolia Assets"
• Make sure all actions are available (as before)
  • Paste action is not available after cut
  • Copy and paste actions are not available when multiple assets are selected
• Make sure all browser columns are available (as before)
• When deleting an asset
  • rename action to "Publish deletion" instead of only "Publish" (as before)

3rd party DAMS naming

• Use "<3rd party name> Assets“ for the tab name of sub apps that connect to a 3rd party tool

See also UX guidelines for migrated apps at https://wiki.magnolia-cms.com/display/DEV/Migration+of+Magnolia+stock+apps+to+M6

• Set explicit app group to Edit (+ app position after Pages)
• Fix app label ("Assets", not DAM)
• Hide old app or even consider unbundling
• Fix column captions and widths/expand ratios