How can I copy only the files out of source subdirectories into a root destination directory?

[SuperTAbrams]

I need to copy source files from subdirectories that are 3 levels down at the source, and only have those PDF files copy over to a single-root destination directory folder.  

This is a recursive copy on subdirectories, and we only want the files, no source directory structure.  

I read one blog paragraph online that said you can do this with FastCopy, but no details.  the help file talks about matching strings, which I hope there is a setting that can be used and not have to type in 31 matches, can even find where to add 31 strings.  Can this be done simply?

[FastCopy support forum]

Sorry, It can't.
(the Filter is just Filter. It doesn't modify/change directory structure)

2021年10月28日木曜日 6:18:12 UTC+9 doc...@msn.com: