Gallery Popup on custom ALB Element

Dear Kriesi-Team

I have created a new element for the Layout Builder. In it the user should be able to open the Select Media popup of the media gallery with a button. However, he should not be able to select images, but PDFs and World files.

This is how id should look like:
https://imgur.com/ITiKVHY – Button for selecting Document
https://imgur.com/esP83PW – Gallery Popup with Documents instead of images

Could you help me with what I have to write into the array “type” to open such a window? I already tried it with “type” => “application”, because in the gallery all such files can be displayed with the URL mypage.ch/wp-admin/upload.php?type=application.
Also everything else I tried did not lead to any result. The button is simply not displayed at all.

This is what I have so far:
array(
“name” => __(“Choose a document”,’avia_framework’ ),
“desc” => __(“Upload a new document, or select an existing one from the media library.”,’avia_framework’ ),
“id” => “id”,
“fetch” => “id”,
“type” => “???”,
“title” => __(“Choose a document”,’avia_framework’ ),
“button” => __(“Choose a document”,’avia_framework’ ),
“std” => “”
),

Many thanks in advance for your help!