I tried the summarize function with the book "Commentary on the New Testament Use of the Old Testament". It worked great.
However, I saw a word in the summary I wanted to find in the book, but when I clicked on the word in the summary, it did not highlight the word in the book. (Yes, Corresponding Words > Same surface text was on.) I had to use the Find function to find the word in the book.
It would be very helpful if the Corresponding Words > Same surface text function worked within in the summary text and bi-directionally between the summary and open resources.