Users can upload images to my web app. Am I required to provide alt text?

User uploaded images are not required by WCAG to have alternative text. However, there are some best practice strategies for ensuring user uploaded images are accessible:

1. Provide an option for users to add alternative text when uploading images.
2. If the file name would be meaningful in context, make the file name the alt text attribute value (For example, alt="filename.png").