There are multiple things wrong with "Use the first image type..." cover art option:

• It applies for all cover art, not only CAA, even if that is implied
• The behavior is confusing. Without a lengthy description it is not clear at all how this interacts with the image naming string
• It is also not clear that this only applies to images that are not "front" images
• It can be completely replicated with a script like " $if($eq(%coverart_maintype%,front),cover,%coverart_maintype%)", which again makes this more confusing

The resulting behavior is, however, useful. And only relying on a script is not too great for someone just looking for a simple solution. We should  move it to the general Cover Art options and give it a separate label or description.

Something like placing it directly after the input for "Use the following file name for images" and label the checkbox something like:

> Always use the primary image type as the file name for non-front images

See also:

https://github.com/rdswift/picard-docs/pull/86

https://community.metabrainz.org/t/cover-art-archive-setting-use-the-first-image-type-as-the-filename-behavior-inverted/521941