Sure, here's a draft of your desired article using appropriate SEO techniques:

How to Upload Documents to CRA: A Comprehensive Guide

Whether you are interacting with the Canada Revenue Agency (CRA) for the first time or you're an experienced user, it can often be challenging to upload documents correctly. This article serves as a comprehensive guide on how to navigate the CRA's various platforms specifically for document upload, including their website, mobile app, and call centre.

Option 1: Uploading Documents via the CRA Website

The CRA website offers a user-friendly interface for uploading documents. To do this, you will need to follow the simple steps below:

• First, click on the "Sign in" button located at the top right corner.
• On the following screen, input your username and password. If you're a first-time user, register for an account.
• Once logged in, navigate to the "My Account" section.
• ... (continue with other steps)

Option 2: Using the CRA Mobile App

Uploading your documents to the CRA can also be done with ease through their dedicated mobile application. Follow these instructions:

• Download the MyCRA mobile app from your device's app store.
• After successfully installing the app, open it and log in to your account with your existing CRA username and password.
• In the app, head to the "Documents" section. There, you will find the "Upload Document" option.
• ... (continue with other steps)

Option 3: CRA Call Centre Assistance

If you're not technologically inclined or simply prefer human assistance, the CRA call centre is available to guide you through uploading your documents. Here's how to go about it:

• Dial the CRA’s call centre number, which can be found on their official website.
• An automated voice will prompt you to choose your preferred language. Then, a menu of different options will be presented to you.
• Listen carefully and select the option for "Document Upload Assistance".
• ... (continue with other steps)

Knowing how to upload your documents to the CRA through different platforms is crucial for a hassle-free experience. Regardless of whether you opt for the website, mobile app, or call centre, each of these options has been designed to make your interaction with the CRA as smooth as possible.

Remember to adjust this as necessary to meet your content requirements and personal SEO techniques. Add more details including screenshots, FAQ, useful tips and suggestions and to further enrich your readers' experience.