Display Alt Text from a PDF

I am trying to ensure my work, most often shared as a PDF via a Box link, is fully accessible, especially to employees using screen readers. This includes making certain every image includes Alternate Text. I do this whether the original document is created in Word, PowerPoint, or InDesign. When these are converted to a PDF and viewed in Adobe Reader or Acrobat, hovering over an image displays the Alt text. However, when the PDF is displayed in Box, the Alt text doesn’t pop up. Is there are way to make this happen? Either a document setting or an enterprise configuration?