By default, the files added in the Media page have only a title and a description. If you need to add more information, we recommend creating a dedicated content type for your media files.
With a dedicated content type, you will have different fields available for any other properties you need. You can add fields for SEO, tags or alt text, and create something that fits your needs.
When creating dedicated content types for your media files, keep in mind that you will need to link them using a “Reference” field, not an image field. This also means that those media files will be located in the Conten tab and not the Media tab. The media file will always be added to the Media tab, but the entry with the file and its extended metadata will be located in the Content tab.