Update app.py

app.py

@@ -365,7 +365,6 @@ def create_and_link_pdfs(source_pdf="TestSource.pdf", target_pdf="TestTarget.pdf
             writer.add_page(page)
         page = writer.pages[0]
         y_position = 800 - (7 * 20)
-        # Use Fit object to specify destination
         fit = Fit(fit_type="/XYZ", fit_args=[50, y_position, 0])
         writer.add_outline_item("Seven Bookmark", 0, fit=fit)
         with open(pdf_file, "wb") as f:
@@ -387,9 +386,10 @@ def create_and_link_pdfs(source_pdf="TestSource.pdf", target_pdf="TestTarget.pdf
         text_pdf = PdfReader(buffer)
         page = writer.pages[0]
         page.merge_page(text_pdf.pages[0])
+        # Use uri instead of target for external file link
         link = Link(
             rect=(90, seven_y - 10, 150, seven_y + 10),
-            target=f"{target}#page=1"
+            uri=f"file://{os.path.abspath(target)}#page=1"
         )
         writer.add_annotation(page_number=0, annotation=link)
         with open(source, "wb") as f: