To copy

• If many empty subdirectories and some has files then copy all files exept folders to other folder

  cd /problemfolder/
  find . -type f -print0 | xargs -I{} -0 cp {} ~/ForexampleDesktop/solutionfolder

  or simpler

  find problemfoldername -type f -exec cp {} solutionfolder/ \;

• To find all specific type files and copy them without folders to one folder use

  find ~/FromPictures -name "*.jpg" -exec cp \{\} ~/ToAll_Pictures/ \;