thanks that you're looking into this, NVDA is free so can be used for testing. I suggest either seeing if the PDF can support alt text, or to have a description written below. thanks!
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That's a good suggestion, thank you!
I'll be honest, when I responded to your first post I thought you were talking about E-Readers, like Kindle. It wasn't until your second post that I understood what you were saying.
Its probably going to be a bit till I have time to figure this out, but I've added it to my work list. Thank you for bringing it to my attention! I'll post an update when I have a solution.