solved detached ArrayBuffer error, by cloning the data every time before use

lib/attachmentWidget.dart

@@ -1,3 +1,5 @@
+import "dart:typed_data";
+
 import "package:crab_ui/structs.dart";
 import "package:flutter/material.dart";
 import 'package:pdfrx/pdfrx.dart';
@@ -14,7 +16,16 @@ class AttachmentWidget extends StatelessWidget {
     if (extension == "jpg") {
       return Image.memory(att.data);
     } else if (extension == "pdf") {
-      return PdfViewer.data(att.data, sourceName: att.name);
+      PdfViewer pdf = PdfViewer.data(
+        Uint8List.fromList(att.data),
+        sourceName: att.name,
+        params: const PdfViewerParams(
+          enableTextSelection: true,
+          scrollByMouseWheel: 0.5,
+        )
+      );
+      
+      return pdf;
     }
     return Text(
       "Attachment not supported for preview, you'll need to download",
@@ -39,19 +50,17 @@ class AttachmentWidget extends StatelessWidget {
                       CloseButton(onPressed: () => {Navigator.pop(context)}),
                       Text(
                         attachment.name
-                            .toString(), //its alr a string but incase ¯\(ツ)/¯
+                            .toString(), //its alr a string but incase ¯\(ツ)/¯ //update: i did that everywhere lol
                         style: TextStyle(
                             color: Colors.black,
                             fontSize: 20,
-                            decoration:
+                            decoration: TextDecoration
-                                TextDecoration.none), //TODO: personalize your fonts
+                                .none), //TODO: personalize your fonts
                       ),
                     ],
                   ),
-                
                   Expanded(
-
+                    child: attachmentViewer(attachment),
-                        child: attachmentViewer(attachment),
                   )
                 ],
               ),