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@caring_navigator9553   I had to use Google translate to see what exactly that message translate from and the error message read: "This file cannot be modified" No further changes can be made to this file. This original file cannot m modified.

In Adobe Scan, this message will usually appears when the PDF has been altered or modified outside of the Adobe Scan app itself. Adobe Scan is designed to allow editing (like adding pages, reordering, or cropping) only for documents that are in their original, unedited state within its own cloud environment. Once an external app modifies the PDF, Adobe Scan cannot rewrite the file's original metadata or maintain the scan's image quality pipeline, so it locks the file to prevent corruption and throws that specific error.