• open nvim

• type :terminal

• then you got the following output:

  iconv: conversion from -t unsupported
  iconv: try 'iconv -l' to get the list of supportedencodings
  Error converting string from to UTF-8
  $ 
  

• Broken cyrillic encoding in a terminal mode #17681 · neovim/neovim
• Neovim can't read UTF-8 characters

Add export LANG=en_US.UTF-8 to your shell profile

:echo expand('%:p')

Here % represents the current buffer.

If you want to insert the full path into the current buffer, use the following command:

:put =expand('%:p')