Robust Copy to... script for Nautilus

Copy_to.sh

#!/bin/bash

dropbox=$(zenity --file-selection --directory)
filelog=""
for arg
do
  if [ ! -f "${dropbox}/${arg}" ] && [ ! -d "${dropbox}/${arg}" ]
  then
    if [ -d "~/.local/share/Trash/files" ]; then
      cp "${PWD}/${arg}" "${dropbox}/${arg}" &&\
      mv -n "${PWD}/${arg}" ~/.local/share/Trash/files
    else
      cp "${PWD}/${arg}" "${dropbox}/${arg}"
    fi
    sleep 1
    if [ -f "${dropbox}/${arg}" ] || [ -d "${dropbox}/${arg}" ]
    then
      filelog="${filelog} '${arg}'"
    else
      notify-send -i error "Copy to..." "Something went wrong!"
    fi
  else
    notify-send -i error "Copy to..." "'${dropbox}/${arg}' already exists!"
  fi
done
filelog=${filelog:1}
notify-send -i info "Copy to..." "${filelog} was copied to' ${dropbox}'"