[BlindTlk] Alt text help

[Vejas Vasiliauskas]

Hi, 
I hope everyone is having a great week. 
Someone sighted has asked me for input with alt-text and image descriptions. This person sent me a page where they said there are 9 images with alt-text descriptions, and they asked if I could see any of the alt-text on my screen-reader. 
I have tried both with an iPhone with VoiceOver and a Windows 10 PC running JAWS, and I'm unable to find the alt-text. I would like to respond with some suggestions or guidance on how the alt-text can be made visible and accessible. Does anyone know of a good resource for this, or a way I can describe to this person how to make the text visible? 
Thank you, 
Vejas