When you change the alt text of a GIF on Bluesky, that change is not saved for others who use the same GIF later. Each user needs to manually add or modify the alt text for their own posts. Bluesky’s system doesn’t store personalized alt text edits globally for GIFs; it applies only to the instance of the post you create.

If you want your alt text to convey accurate context for accessibility, you should always check and update it when you post a GIF, as autogenerated alt text is often generic or incorrect. This ensures the meaning behind the GIF is clear for screen reader users or others relying on alt text.