A warning is displayed when boosting a media not having media descriptions.
https://storage.gra.cloud.ovh.net/v1/AUTH_91eb37814936490c95da7b85993cc2ff/tootfedilabapp/media_attachments/files/110/006/898/327/222/590/original/6d411c7d6567f146.jpg
We made the choice with #Fedilab to enable by default accessibility warnings.
That means you will be warn if you publish media without content descriptions or when boosting messages not having media descriptions.
Also, don't forget that Fedilab now supports the edition of media in messages, so you can update if you forgot to add a media description.
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