Rails Active Storage ,How Can I Keep Existing Files / Uploads? - ruby-on-rails

Question

i am having a problem where i want to upload images
Say i have clicked the file_field button and uploaded 'test.jpg' image, now when i click the file_field button to upload another image, it overwrites the previous ones , i want to make it happen so that it keeps on appending images whenever we upload more images instead of replacing itself
by reading docs and other peoples questions ,what i came to know is that i need to add
config.active_storage.replace_on_assign_to_many = false
inside config/application.rb,
few even said we have to put it inside config/environments/development.rb
so i placed that code in both of them and still the file_field keeps overwriting whenever i try to upload it again
pages_controller.eb
class PagesController < ApplicationController
def index
end
# GET to /pages/new
def new
#order = Order.new
end
# POST to /pages/new
def create
# Inserts data into the Orders table
#order = Order.new(order_params)
end
private
def order_params
params.require(:order).permit(:paper_size, :color, :quantity, :type, :description, :first_name, :last_name, :phone_numnber, :email, contents:[] )
end
end
order.rb (model)
class Order < ApplicationRecord
validates :paper_size, presence: true
validates :color, presence: true
validates :quantity, presence: true
validates :type, presence: true
validates :first_name, presence: true
validates :last_name, presence: true
validates :phone_number, presence: true
validates :email, presence: true
has_many_attached :contents
end
new.html.erb
<%= form_for #order, url: new_page_path do |f| %>
<div class="container">
<h1 class="text-center">Order From Home!</h1>
<div class="row">
<div class="col-md-4 col-md-offset-4">
<%= f.label :first_name%>
<%= f.text_field :first_name, class:"form-control" %><br/>
<%= f.label :last_name %>
<%= f.text_field :last_name, class:"form-control" %><br/>
<%= f.label :phone_number %>
<%= f.text_field :phone_number, class:"form-control" %><br/>
<%= f.label :email %>
<%= f.text_field :email, class:"form-control" %><br/>
<%= f.label :content %>
<%= f.file_field :content, multiple: true %><br/>
<%= f.label :paper_size %>
<%= f.select :paper_size, ['A4', 'B4'], { prompt: 'Select' }, class:'form-select' %><br/>
<%= f.label :color %>
<%= f.select :color, ['Black & White', 'Color'], { prompt: 'Select' }, class:'form-select' %><br/>
<%= f.label :quantity %>
<%= f.select :quantity, options_for_select(0..500), { prompt: "Select" }, class:'form-select' %><br/>
<%= f.label :description %>
<%= f.text_area :description, class:"form-control" %><br/>
<div class="btn-order">
<%= f.submit %>
</div>
</div>
</div>
</div>
<% end %>