Here is a great article about making digital content universally accessible. As school districts invest in digital materials, they sometimes lack in understanding of the need for accessible even for these items.
On that note, we also have to understand digital is not always the way to go! A social studies textbook that is digital is great, except for maps and graphs. My braille reading student still needs to get hands on graphs and maps for true understanding of this type of representation. Did the school district ask how this student would get access to these materials?