file manager image thumbnails don't have text alternatives

[rjkati]

Descriptive summary

On dev.nurax.samvera.org (Hyrax 5.0.1), the link in the image thumbnail on the file manager page does not have a text alternative and does not meet WCAG AA requirements

Steps to reproduce the behavior in User Interface (UI)

1. In Chrome, download the Site Improve browser extension
2. As an admin, go to https://dev.nurax.samvera.org/concern/images/ww72bb76t/file_manager?locale=enand run the Site Improve browser extension

[rjkati]

Note that both the link highlighted in the screenshot above and the image thumbnail do not have text alternatives.