Lose highlighting when Index.wiki is loaded from Dropbox

I have put my Vim files, including my Vimwiki files, in a Dropbox folder. I would like to be able to access them from both MacOS (MacVim) and iOS (iVim). However, when I open the Vimwiki index file ("index.wiki") in either app the highlighting of links that enables navigation among Vimwiki files is lost. What happened? How do I restore it?

Thanks
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Eric Weir
Decatur, GA USA
eeweir@bellsouth.net

"Imagining the other is a powerful antidote to fanaticism and hatred."

- Amos Oz

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