exporting and opening formatting presets

Hi, I saw in the tutorial where I could export my presets then use Open in…scrivener to open them in my IOS vs of Scrivener. I’m having trouble making this work.
I have exported it from my current file into dropbox. I’ve tried putting just in dropbox and also in APPS/Scrivener. But when I open dropbox and find the file, I don’t see any open in… options.

Could you provide more detailed steps to do this?

same problem. iOS9