Q: Why is it saying there is a lot of visual content and it is best read on a screen?
A: This error message is from the Outlook app, using the Play My Email feature. It does not appear to work correctly and says this message instead of reading out perfectly valid content.
Speaking Email does not have this issue, and will read out both HTML and plain text emails with or without images no problem. So the solution is to download Speaking Email instead of using Outlook :)
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