Is Alt Text of Images Searchable?

Occasional Visitor

I have a lot of math lesson type documents that have lots of screenshots/images. The problem is, whenever I try to search for something, I can't because the key word is part of an image and not text. I have a way to extract the text from the image and then put than into the alt text. But when I search, it still doesn't show up. Any fixes? Thanks!

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