The duplicate and override file option doesn't appear on the Edit Media screen.
I can find it by going to:
Media Library Grid view (/wp-admin/upload.php?mode=grid)
Clicking on an image (Attachment Details page)
The "send new file and replace" and "Duplicate" options are on the top right
I can't find it when I go to:
Media List view (/wp-admin/upload.php?mode=list)
Click on an image (Edit Media page)
The "send new file and replace" and "Duplicate" options are not shown
It would be great to have these links on the Edit Media page as well? I'm sure we're going to have users that won't know they have to switch to the Grid view before they can replace/duplicate files.
Thanks for considering the above.