Per WCAG 2.0, non-text content should have a text-based alternative accessible to screen readers. Suitcase supports this standard by providing content creators with an "alternative text" (often abbreviated as alt text) field for adding image descriptions. Alt text should not be too long so that screen reader users are not inconvenienced.
Guidelines - 1.1.1 – Non-text Content – Level A – Quick Guide
Wuhcag - 1.1.1- Non-text Content - Level A - Wuhcag
ISU Resource - Learn more about alt text at Digital Access.