Finding Large Files Uncacheable in Acquia Varnish
Acquia varnish cannot cache files >10MB as per https://docs.acquia.com/acquia-cloud/performance/varnish/files/
To find for those >10MB files, search from the sites/default/files:
1find ./ -type f -size +10M -exec du -sh '{}' \; -print|grep -v ^\./| sort -n