I’d like to see which files the software was unable to scan and why. Is there more information about this? There is nothing on the report except the number of files unable to scan
What is in the log file depends on the settings you have.
Verbose will show put (about?) everything in the log file.
https://blog.avast.com/2014/02/28/how-do-i-handle-files-that-avast-cant-scan/
Are you not seeing the scan details directly after you run the scan ?
You may need to scroll to the right (or expand the column width) of that scan information to see the reason given for being unable to scan.
Using the verbose (check every option) setting for your log/report file will result in a massive log file, just check/add the Skipped Items.