Ultisnips %%, and %%v

[ixil]

I get an error trying to use these snippets, for %% I get an error itself

vim.error: Vim:E117: Unknown function: Filename

for %%v the snippet expands, but to is produced

`!v Filename('', 'title')`

(https://github.com/honza/vim-snippets/blob/master/autoload/vim_snippets.vim) has examples of what might be useful