Thanks for all the attempts at help so far. However, none of them seem to be applicable.
However, I have made a slight step forward - the correct field name is actually "last_modified:", not "modified:" (discovered by putting the cursor in the column header). So if I change the search term to:
last_modified:>date:
I still get nothing, but also an error message:
Date conversion error: date:
So my search term is still wrong. Both should be dates, but ??
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