Rails - My 'create/new' method doesn't work - ruby-on-rails

Question

I've created a form so the user can add a new picture to the website catalog, but for some reasons it doesn't work. Once the form is filled out, I click on the 'Submit' button but nothing happens, I just stay on the same page (and I don't have any error message...).
I don't think the error comes from my Controller since nothing happens when I add the raise keyword in my Controller's 'create' method.
I'm sure this is an amateur mistake... but I can't see what it is. Thanks for your help!
picture.rb /
Picture model:
class Picture < ApplicationRecord
validates :name, presence: true
has_many_attached :photo
end
new.html.erb /
Here is my form :
<%= form_for(#picture) do |f| %>
<div class="form-group">
<%= f.label :name, "Please indicate the name" %>
<%= f.text_field :name, class:"form-control", placeholder:"(mandatory field)" %>
</div>
<div class="form-group">
<%= f.label :description, "Add a description" %>
<%= f.text_area :description, class:"form-control" %>
</div>
<div class="form-group">
<div class="row">
<div class="col">
<%= f.label :category, "Add a category" %>
<%= f.text_field :category, class:"form-control" %>
</div>
<div class="col">
<%= f.label :price, "Indicate the price (when applicable)" %>
<%= f.number_field :price, class:"form-control", placeholder:"0,00$ CAD" %>
</div>
</div>
</div>
<div class="form-group">
<div class="row">
<div class="col">
<p>Where do you want to add this item?</p>
<div>
<%= f.check_box :is_home_item %>
<%= f.label :is_home_item, "Homepage" %>
</div>
<div>
<%= f.check_box :is_portfolio_item %>
<%= f.label :is_portfolio_item, "Work" %>
</div>
<div>
<%= f.check_box :is_sketchbook_item %>
<%= f.label :is_sketchbook_item, "Sketchbook" %>
</div>
<div>
<%= f.check_box :is_shopping_item %>
<%= f.label :is_shopping_item, "Shopping" %>
</div>
</div>
<div class="col">
<div class="form-group">
<%= f.label :photo, "Select your picture" %>
<%= f.file_field :photo, class:"form-control-file" %>
</div>
</div>
</div>
</div>
<div class="form-group">
<%= f.submit class:"btn btn-lg btn-primary" %>
</div>
<% end %>
pictures_controller.rb /
class PicturesController < ApplicationController
def new
#picture = Picture.new
end
def create
#picture = Picture.new(picture_params)
if #picture.save
redirect_to root_path(#picture), notice: "Picture was successfully created"
else
render :new
end
end
private
def picture_params
params.require(:picture).permit(:name, :description, :category, :price, :is_home_item, :is_portfolio_item, :is_sketchbook_item, :is_shopping_item, :photo)
end
end
And here is the text I got on my local server console
Here is the HTML output of my form :
<form>
<input type="hidden" name="authenticity_token" value="7MxWbzbltjXcAx2dvgRwIu07WMpyjPQji6LI6ELifMZODLJyMBucNApnPRk8vsjshSEjyMMenDUfvDw6pN+/4Q==">
<div class="form-group">
<label for="picture_name">Indicate the name</label>
<input class="form-control" placeholder="(mandatory field)" type="text" name="picture[name]" id="picture_name">
</div>
<div class="form-group">
<label for="picture_description">Add a description</label>
<textarea class="form-control" name="picture[description]" id="picture_description"></textarea>
</div>
<div class="form-group">
<div class="row">
<div class="col">
<label for="picture_category">Add a category</label>
<input class="form-control" type="text" name="picture[category]" id="picture_category">
</div>
<div class="col">
<label for="picture_price">Indicate the price (when applicable)</label>
<input class="form-control" placeholder="0,00$ CAD" type="number" name="picture[price]" id="picture_price">
</div>
</div>
</div>
<div class="form-group">
<div class="row">
<div class="col">
<p>Where do you want to add your picture?</p>
<div>
<input name="picture[is_home_item]" type="hidden" value="0"><input type="checkbox" value="1" name="picture[is_home_item]" id="picture_is_home_item">
<label for="picture_is_home_item">Homepage</label>
</div>
<div>
<input name="picture[is_portfolio_item]" type="hidden" value="0"><input type="checkbox" value="1" name="picture[is_portfolio_item]" id="picture_is_portfolio_item">
<label for="picture_is_portfolio_item">Work</label>
</div>
<div>
<input name="picture[is_sketchbook_item]" type="hidden" value="0"><input type="checkbox" value="1" name="picture[is_sketchbook_item]" id="picture_is_sketchbook_item">
<label for="picture_is_sketchbook_item">Sketchbook</label>
</div>
<div>
<input name="picture[is_shopping_item]" type="hidden" value="0"><input type="checkbox" value="1" name="picture[is_shopping_item]" id="picture_is_shopping_item">
<label for="picture_is_shopping_item">Shopping</label>
</div>
</div>
<div class="col">
<div class="form-group">
<label for="picture_photo">Select your picture</label>
<input class="form-control-file" type="file" name="picture[photo]" id="picture_photo">
</div>
</div>
</div>
</div>
<div class="form-group">
<input type="submit" name="commit" value="Create Picture" class="btn btn-lg btn-primary" data-disable-with="Create Picture">
</div>
My routes :
Rails.application.routes.draw do
devise_for :users
# Pages routes
root to: 'pages#home'
get 'about', to: 'pages#about'
get 'portfolio', to: 'pages#portfolio'
get 'sketchbook', to: 'pages#sketchbook'
get 'shopping', to: 'pages#shopping'
# Pictures routes
resources :pictures
end
And these are my routes in the Terminal

Answer 1

Not quite sure why this is happening, but form_for is deprecated, so you should replace it with form_with.
You can use a model, such as your #picture with form_with as described in the docs.
<%= form_with(model: #picture) do |form| %>
# fields
<% end %>
This should create a form DOM object that looks like this:
<form action="/pictures" method="post" accept-charset="UTF-8" >
<input name="authenticity_token" type="hidden" value="..." />
...
</form>
If for some reason it doesn't, you can always pass a method: :post in the form_with (ie. <%= form_with(model: #picture, method: :post) do |form| %>).

Answer 2

Currently, you have got has_many_attached with a singular photo. That does not seem to be the right syntax. Have you tried changing to has_many_attached :photos and modifying the picture_params to have photos passed as an array photos: []?
Or if you wanted to attach one photo, then you should try changing to has_one_attached :photo in the Picture model.