"files not included due to access errors" - how to find them?

How can I find the “not included” files?
These posts ask the question, but no answer was found:

and where is the “log file”? is it the CLI output?

Running Duplicacy CLI v 2.6.2 on Ubuntu 18.04.5

If you scroll up the output you’ll see messages like Failed to open file for reading for each file or directory that can’t be opened.