Comment 1 for bug 1067416

You are right, there is a step missing in the documentation - it only
became necessary recently. I added this to the documentation and pushed
a new version, for your convenience, the paragraph is repeated here:

UltiSnips also needs that Vim sources files from the after/ directory.
Unfortunately, vim only allows this in the home directory. You therefore have
to symlink/copy the files from after: >
    mkdir -p ~/.vim/after/plugin/
    ln -s ~/.vim/ultisnips_rep/after/plugin/* ~/.vim/after/plugin/

  status fixcommitted
  importance medium