file_fieldで作成したボタンを押しても反応がなく、画像を選択できない

Rails.application.routes.draw do
  devise_for :cliants, controllers: {
    sessions:      'cliants/sessions',
    passwords:     'cliants/passwords',
    registrations: 'cliants/registrations'
  }
  devise_for :trainers, controllers: {
    sessions:      'trainers/sessions',
    passwords:     'trainers/passwords',
    registrations: 'trainers/registrations'
  }
  root to: 'posts#index'
  resources :posts, only: [:new, :create]
end

class PostsController < ApplicationController
  def index
  end

  def new
    @post = Post.new
  end

  def create
    @post = Post.new(post_params)
    if @post.save
      redirect_to root_path
    else
      render :new
    end
  end

  private

  def post_params
    params.require(:post).permit(:title, :today, :explanation, :image).merge(cliant_id: current_cliant.id)
  end
end

class Post < ApplicationRecord
  belongs_to :cliant
  has_one_attached :image

  with_options presence: true do
    validates :title
    validates :today
    validates :explanation
    validates :image
  end
end

<%= form_with model: @post, local: true do |f| %>
  <div class="field">
    <%= f.label :title, "タイトル" %><br />
    <%= f.text_field :title, id: "posts_title" %>
  </div>

  <div class="field">
    <%= f.label :date, "投稿日" %><br />
    <%= f.date_select :date, id: "posts_date" %>
  </div>

  <div class="field">
    <%= f.label :explanation, "説明文" %><br />
    <%= f.text_area :explanation, class: :form_text, id: "posts_explanation" %>
  </div>

  <div class="field">
    <%= f.label :image, "食事写真" %><br />
    <%= f.file_field :image , id:"posts_image" %>
  </div>

  <div class="actions">
    <%= f.submit "保存する", class: :form_btn %>
  </div>
<% end %>

# This migration comes from active_storage (originally 20170806125915)
class CreateActiveStorageTables < ActiveRecord::Migration[5.2]
  def change
    create_table :active_storage_blobs do |t|
      t.string   :key,        null: false
      t.string   :filename,   null: false
      t.string   :content_type
      t.text     :metadata
      t.bigint   :byte_size,  null: false
      t.string   :checksum,   null: false
      t.datetime :created_at, null: false

      t.index [ :key ], unique: true
    end

    create_table :active_storage_attachments do |t|
      t.string     :name,     null: false
      t.references :record,   null: false, polymorphic: true, index: false
      t.references :blob,     null: false

      t.datetime :created_at, null: false

      t.index [ :record_type, :record_id, :name, :blob_id ], name: "index_active_storage_attachments_uniqueness", unique: true
      t.foreign_key :active_storage_blobs, column: :blob_id
    end
  end
end