Auto Classify - Any tips on usage?

I was wondering if anyone could give me some tips on using Auto Classify. I have never gotten this feature to work over the years and would like to know either what I am doing wrong or how others have used this with success. I keep my files in a number of Groups but not many sub-groups within these groups. The Move To feature works very well but Auto Classify has never worked for me.

Thanks!

The better you’re grouping your stuff, the better the results will be. Few groups and lots of files mean that the groups are probably too generic.