Re: Adding alt tags to images?
I know of no way to add alt text to image files themselves in a way that a screen reader picks up on. That sort of alt text is a function of the thing into which the image is embedded, such as a Word Document or webpage.
One can add alt text to image metadata, but screen readers do not look at image metadata to decide what they're going to announce for an image.
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore