diff --git a/.gitignore b/.gitignore
old mode 100644
new mode 100755
diff --git a/180274_20250915_Rechnung-32096_xml.pdf b/180274_20250915_Rechnung-32096_xml.pdf
new file mode 100755
index 0000000..b765052
Binary files /dev/null and b/180274_20250915_Rechnung-32096_xml.pdf differ
diff --git a/EN16931_Physiotherapeut_fx.pdf b/EN16931_Physiotherapeut_fx.pdf
new file mode 100755
index 0000000..07fc4cb
Binary files /dev/null and b/EN16931_Physiotherapeut_fx.pdf differ
diff --git a/UBL-Invoice-2.1.xsd b/UBL-Invoice-2.1.xsd
old mode 100644
new mode 100755
diff --git a/Verkauf_Rechnung_Neu.pdf b/Verkauf_Rechnung_Neu.pdf
index e69de29..3889203 100755
Binary files a/Verkauf_Rechnung_Neu.pdf and b/Verkauf_Rechnung_Neu.pdf differ
diff --git a/Verkauf_Rechnung_Neu_xml.pdf b/Verkauf_Rechnung_Neu_xml.pdf
deleted file mode 100644
index e69de29..0000000
diff --git a/appended.pdf b/appended.pdf
old mode 100644
new mode 100755
diff --git a/appended.xml b/appended.xml
old mode 100644
new mode 100755
diff --git a/appended_xml.pdf b/appended_xml.pdf
old mode 100644
new mode 100755
diff --git a/debug.log b/debug.log
old mode 100644
new mode 100755
index 4e34f46..9d0ce1d
--- a/debug.log
+++ b/debug.log
@@ -15,3 +15,30 @@
 2024-08-22 22:24:08 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: 'appended.xml' output: 'test.pdf'
 2024-08-22 22:26:44 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
 2024-08-22 22:26:44 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 12:46:16 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 12:46:16 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 12:46:16 leave appendToPdf
+2025-12-23 12:47:31 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 12:47:45 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 12:47:52 leave appendToPdf
+2025-12-23 12:54:59 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 12:54:59 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 12:59:27 leave appendToPdf
+2025-12-23 12:59:37 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 12:59:37 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 12:59:42 leave appendToPdf
+2025-12-23 13:53:49 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 13:53:49 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 13:53:49 leave appendToPdf
+2025-12-23 13:54:19 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 13:54:19 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 13:54:26 leave appendToPdf
+2025-12-23 13:55:26 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2025-12-23 13:55:26 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2025-12-23 13:55:26 leave appendToPdf
+2026-02-05 19:47:45 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2026-02-05 19:47:45 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2026-02-05 19:47:45 leave appendToPdf
+2026-02-05 19:48:32 enter appendToPdf(./Verkauf_Rechnung_Neu.pdf, ./appended.xml, test.pdf)
+2026-02-05 19:48:32 pdfInput: './Verkauf_Rechnung_Neu.pdf' xmlInput: './appended.xml' output: 'test.pdf'
+2026-02-05 19:48:32 leave appendToPdf
diff --git a/dll/dll.go b/dll/dll.go
old mode 100644
new mode 100755
diff --git a/go.mod b/go.mod
old mode 100644
new mode 100755
diff --git a/go.sum b/go.sum
old mode 100644
new mode 100755
diff --git a/invoice.xml b/invoice.xml
old mode 100644
new mode 100755
diff --git a/invoice_2.xml b/invoice_2.xml
old mode 100644
new mode 100755
diff --git a/lib/append.go b/lib/append.go
old mode 100644
new mode 100755
index 74fe159..79d756e
--- a/lib/append.go
+++ b/lib/append.go
@@ -1,8 +1,11 @@
 package lib
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
+	"os"
+	"path"
 	"path/filepath"
 	"strings"
 
@@ -41,9 +44,17 @@ func AppendToPdf(inputPdfFilePath string, inputXmlFilePath string, outputFilePat
 		),
 	)
 
-	err := api.AddAttachmentsFile(
-		inputPdfFilePath,
-		outputFilePath,
+	inputFile, err := os.Open(inputPdfFilePath)
+	if err != nil {
+		return err
+	}
+	defer inputFile.Close()
+
+	dest := bytes.Buffer{}
+
+	err = api.AddAttachments(
+		inputFile,
+		&dest,
 		[]string{inputXmlFilePath},
 		true,
 		model.NewDefaultConfiguration(),
@@ -52,5 +63,35 @@ func AppendToPdf(inputPdfFilePath string, inputXmlFilePath string, outputFilePat
 		return err
 	}
 
+	source := bytes.NewReader(dest.Bytes())
+	dest = bytes.Buffer{}
+
+	err = api.AddProperties(source, &dest, map[string]string{
+		"DocumentFileName":           path.Base(inputXmlFilePath),
+		"DocumentType":               "INVOICE",
+		"ConformanceLevel":           "EN 16931",
+		"SchemasSchema":              "Factur-X PDFA Extension Schema",
+		"SchemasPrefix":              "fx",
+		"SchemasPropertyName":        "DocumentFileName",
+		"SchemasPropertyValueType":   "Text",
+		"SchemasPropertyCategory":    "external",
+		"SchemasPropertyDescription": "The name of the embedded XML document",
+	}, model.NewDefaultConfiguration())
+	if err != nil {
+		return err
+	}
+
+	var outputFile *os.File
+	outputFile, err = os.Create(outputFilePath)
+	if err != nil {
+		return err
+	}
+	defer outputFile.Close()
+
+	_, err = outputFile.Write(dest.Bytes())
+	if err != nil {
+		return err
+	}
+
 	return nil
 }
diff --git a/lib/debug.go b/lib/debug.go
old mode 100644
new mode 100755
diff --git a/lib/extract.go b/lib/extract.go
old mode 100644
new mode 100755
diff --git a/main.go b/main.go
old mode 100644
new mode 100755
diff --git a/test.pdf b/test.pdf
index e69de29..a90b1c0 100644
Binary files a/test.pdf and b/test.pdf differ