• yetAnotherUser@lemmy.ca
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      14 hours ago

      You just need to write the alt text inside the square brackets, like this:

      ![Write the alt text here](example.com/this-is-where-you-write-the-link-to-the-image)
      

      This works in pretty much every platform that accepts Markdown images. If you want a reference for what Markdown syntax Lemmy supports, read this page.