You can’t attach or display a PDF in an App Task just by adding a file property in the action schema. App Tasks currently don’t support file attachments directly.
Store the PDF in Orchestrator Storage Bucket / SharePoint / local path
Pass the file path or URL as a string to the App Task
In the app, show it as a link so the approver can open/download the PDF
That’s why the file property doesn’t appear in Studio — it’s not supported for App Tasks yet.