active_storage_engine.rb.rb

...

module ActiveStorage
  class Engine < Rails::Engine

    ...
      
    config.active_storage.variable_content_types = %w(
          image/png
          image/gif
          image/jpg
          image/jpeg
          image/pjpeg
          image/tiff
          image/bmp
          image/vnd.adobe.photoshop
          image/vnd.microsoft.icon
          image/webp
          image/avif
          image/heic
          image/heif
        )
    
    ...
  end
end