Update form_submission_pdf_backups.md (#19436)

modules/simple_forms_api/app/services/simple_forms_api/form_remediation/docs/form_submission_pdf_backups.md

@@ -2,10 +2,6 @@
 
 This documentation covers the setup and usage of the PDF upload/download solution, designed to handle individual form submissions as PDF files within an AWS S3 bucket.
 
-The following image depicts how this solution is architected:
-
-![Error Remediation Architecture](./error_remediation_architecture.png)
-
 ---
 
 ## Table of Contents
@@ -17,6 +13,7 @@ The following image depicts how this solution is architected:
     - [Configuration](#configuration)
   - [Usage](#usage)
     - [Individual Processing](#individual-processing)
+    - [S3 Pre-Signed URL Retrieval](#s3-pre-signed-url-retrieval)
   - [Extending Functionality](#extending-functionality)
     - [Overrideable Classes](#overrideable-classes)
     - [Directory and File Structure](#directory-and-file-structure)
@@ -82,20 +79,21 @@ By default, the solution uses the `:benefits_intake_uuid` identifier to query `F
 
 ### Individual Processing
 
-To handle a single PDF upload for a form submission, instantiate the `S3Client` directly with the appropriate configuration and submission ID:
+To handle a single PDF upload for a form submission, instantiate the `S3Client` directly with the appropriate configuration and submission ID. For backup purposes, specify `type: :submission` during initialization. This ensures that only the original form PDF is uploaded and a presigned URL is generated:
 
 ```ruby
 config = YourTeamsConfig.new
-client = SimpleFormsApi::FormRemediation::S3Client.new(config:, id: <YOUR_SUBMISSION_ID>)
+client = SimpleFormsApi::FormRemediation::S3Client.new(config:, id: <YOUR_SUBMISSION_ID>, type: :submission)
 client.upload
 ```
 
-For backup purposes, specify `type: :submission` during initialization. This ensures that only the original form PDF is uploaded and a presigned URL is generated:
+### S3 Pre-Signed URL Retrieval
+
+To handle a single PDF download for an already archived form submission, call the `fetch_presigned_url` class method on the `S3Client` class with the appropriate configuration and submission ID:
 
 ```ruby
 config = YourTeamsConfig.new
-client = SimpleFormsApi::FormRemediation::S3Client.new(config:, id: <YOUR_SUBMISSION_ID>, type: :submission)
-client.upload
+SimpleFormsApi::FormRemediation::S3Client.fetch_presigned_url(<YOUR_SUBMISSION_ID>, config:)
 ```
 
 ---
@@ -108,10 +106,12 @@ Each component of this solution can be extended or customized to meet team requi
 2. Create subclasses for required functionality.
 3. Register the subclass in your configuration:
 
+Extending the uploader:
+
 ```ruby
 # frozen_string_literal: true
 
-require 'simple_forms_api/form_remediation/configuration/base'
+require 'simple_forms_api/form_remediation/uploader'
 
 class NewUploader < SimpleFormsApi::FormRemediation::Uploader
   def size_range
@@ -120,6 +120,8 @@ class NewUploader < SimpleFormsApi::FormRemediation::Uploader
 end
 ```
 
+Using the new uploader within your own team's configuration:
+
 ```ruby
 # frozen_string_literal: true
 
@@ -136,6 +138,8 @@ class NewConfig < SimpleFormsApi::FormRemediation::Configuration::Base
 end
 ```
 
+Instantiate the client with your team's configuration:
+
 ```ruby
 config = NewConfig.new
 client = SimpleFormsApi::FormRemediation::S3Client.new(config:, id: <YOUR_SUBMISSION_ID>, type: :submission)