upgrade gradle

lib/pages/widgets/pdf_screen.dart

@@ -8,7 +8,7 @@ import 'package:fcs/pages/widgets/local_app_bar.dart';
 import 'package:fcs/pages/widgets/progress.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_pdfview/flutter_pdfview.dart';
-import 'package:share/share.dart';
+import 'package:share_plus/share_plus.dart';
 
 class PDFScreen extends StatefulWidget {
   final String? title;
@@ -112,8 +112,7 @@ class _PDFScreenState extends State<PDFScreen> with WidgetsBindingObserver {
 
   _share() async {
     final RenderBox box = context.findRenderObject() as RenderBox;
-    await Share.shareFiles([file!.path],
-        mimeTypes: ["application/pdf"],
+    await Share.shareXFiles([XFile(file!.path)],
         subject: "File",
         sharePositionOrigin: box.localToGlobal(Offset.zero) & box.size);
   }