How does nvim sync work? How can I debug it?

[echo-bravo-yahoo]

Register syncing to nvim doesn't work. I've:

• Run zstyle :zle:evil-registers:'[A-Za-z%#]' editor nvim in a shell, then attempted to cut lines ("zdd) to both pre-existing and then newly-created nvim instances.
• Added zstyle :zle:evil-registers:'[A-Za-z%#]' editor nvim to my .zshrc after zplug load and attempted to use it as above.
• Disabled NVM lazy load on a hunch that nvim resolving to a lazy load function may have been breaking evil-registers.

None of these allowed me to successfully sync to nvim, and I don't know where to go next for debugging.

OS X, NVIM v0.10.0

[xPMo]

• Check to see if the setup-editor ran correctly.
  • Run zstyle -L ':zle:evil-registers:*'
  • Do you see lines with nvim-put and nvim-yank?
• Check that the correct server socket is getting selected.
  • Inside Nvim: :echo v:servername
  • Run print -l {$XDG_RUNTIME_DIR,/tmp}/nvim*(N=oN).
  • Is Nvim's server socket the first in the list?
• Test the server connection.
  • Yank some text into the register z in Nvim.
  • Run nvim --headless --server $socket --remote-expr "getreg('z')".
  • Do you get the text on stdout?