Introduction to Blackboard Ally
Blackboard Ally is a tool built into the LMS that allows you to identify and correct accessibility issues in your course content. Ally provides you guidance on how to correct accessibility issues with your online course content, which means your learning materials will work better on mobile phones and tablets as well as with assistive technologies.
When you upload a file into your course, you will see colored dial icons called “Ally Indicators” 
next to your course files that provide a score based on how accessible your file is.
Click on the Ally indicator icon for detailed feedback on the accessibility of your content as well as how to correct the accessibility issues with your files.
Getting Started:
Quick Start: Ally Basics
Quick Start: InstructorFeedback
Quick Start: Accessibility Checklist:BestPractices