Currently, it is possible to add alt text to images scheduled to Twitter, Mastodon, LinkedIn, Pinterest, and Facebook through Buffer.
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When you have added an image to your post in the Buffer composer (Learn more about scheduling posts on the Buffer mobile app here), tap Add Description to add your alt text, and then tap Done to save the changes. From there, you can finish scheduling your post.
It is not possible to add alt text for Instagram or TikTok posts in Buffer at this time. We are committed to improving in the area of accessibility, and you can find our full Accessibility Statement here.