The files in this batch (pdf, wav, tiff) didn't have enough structured data to categorize them automatically. Especially in the case of images (like this one) the file name was all we had to work with.
Lacking good metadata, they have to be categorized manually, which requires expert knowledge.
The files ended up in Category:Media_contributed_by_the_Swedish_Performing_Arts_Agency:_needing_categorisation.
We can encourage the svwp community to help with this task. We can also connect it with T219488, and showcase the community's engagement in the blog post.
Ping @AxelPettersson_WMSE who knows about this stuff.