Nvim: Configure plugins in after directory

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.config/nvim/after/plugin/ultisnips.rc.vim

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+" Set completeopt to have a better completion experience
+set completeopt=menuone,noinsert,noselect
+let g:completion_enable_snippet = 'UltiSnips'
+iunmap <Tab>
+imap <c-s> <C-R>=UltiSnips#ExpandSnippet()<CR>
+let g:UltiSnipsExpandTrigger="<c-s>"
+let g:UltiSnipsJumpForwardTrigger="<c-n>"
+let g:UltiSnipsJumpBackwardTrigger="<c-p>"