Search and display only downloaded files - "local:" not working?

I'm trying to list only my downloaded resources in either my tablet or phone - both using iOS.  I recall that the way go do this is to use the search term "local:", that is, lower case "local" appended with a colon.  

However, this gives zero hits for me, and I know I have >200 resources on one and ~50 on the other.  Is this feature broken in the update? Or is my memory playing tricks on me, and I'm using the wrong search term?

Thanks  in advance. JZ