Using Plug command in a $XDG_CONFIG_HOME/nvim/plugin file is not working

[neur1n]

Explain the problem here ...

I have a file, $XDG_CONFIG_HOME/nvim/plugin/n_plug.vim, which contains the call plug#begin(), Plug 'some/plugin', call plug#end() lines. Such configurations made all the listed plugins loaded when they were in init.vim, but not in the n_plug.vim file. It seems that I can use Plug 'some/plugin', {'on': []} and call plug#load('plugin') to make a plugin loaded, but I don't understand why the addtional call plug#load() is needed. I've also tried to debug vim-plug but couldn't found the reason.

NVIM v0.7.0
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compiled by runneradmin@fv-az320-113

Features: -acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM\sysinit.vim"
  fall-back for $VIM: "C:/Program Files/nvim/share/nvim"

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