illustrator files (.Ai) not opening directly in Nextcloud iOS app (No Previews, recognized as image but not PDF)

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Steps to reproduce

1. Open Nextcloud iOS app (version 7.1.7.2).
2. Navigate to any Group Folder or Personal Folder.
3. Tap on a illustrator files (.Ai)
4. Only the "mountainand sun" icon shown but no preview of .ai files as PDF

Expected behaviour

After tapping a illustrator (.Ai) file, the preview of files in pages should shown similar as a PDF file. This was working in ownCloud before we migrated to nextcloud.

Actual behaviour

Only the "mountainand sun" icon shown but no preview of .ai files as PDF

Logs

If applicable, you can post the iOS app or server logs (removing any sensitive information).

Reasoning or why should it be changed/implemented?

Environment data

iOS version: iOS 17.7.2

Nextcloud iOS app version: 7.1.7.2

No file, test, or entry point is named. First reproduce the issue in the Nextcloud iOS app 7.1.7.2 using an Illustrator (.Ai) file in a Group Folder or Personal Folder, then trace the existing PDF preview path; done means .Ai files show page previews instead of only the mountain-and-sun icon.