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Hi @esquipulas
This is not a built in function in WordPress so you must install our plugin alt manager to do so.
If your images alt not bulk updating this means cache issue or you trying to use it on a pro post type feature.
If you did all mentioned instructions and it didn’t work that means their is a bug, contact us so we can help to fix it.
Thanks for reaching us and we are more than happy to help anytime.
Regards