diff --git a/flutter/lib/pages/drawing_page.dart b/flutter/lib/pages/drawing_page.dart
index 35f31df..8b3bef5 100644
--- a/flutter/lib/pages/drawing_page.dart
+++ b/flutter/lib/pages/drawing_page.dart
@@ -1,9 +1,8 @@
-import 'dart:io';
-
-import 'package:graphs/curve_painter.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:graphs/src/graph.dart';
+import 'package:graphs/curve_painter.dart';
+
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/material.dart';
 
 Graphs getGraph() {
   List<Dot> d = <Dot>[];
@@ -28,10 +27,11 @@ class _DrawingPageState extends State<DrawingPage> {
 
   final _textNameController = TextEditingController();
   final _textNumbController = TextEditingController();
-  final _textDistController = TextEditingController();
+  final _textDestController = TextEditingController();
   final _textLnthController = TextEditingController();
+
   void clearTextControllers() {
-    _textDistController.clear();
+    _textDestController.clear();
     _textNumbController.clear();
     _textLnthController.clear();
     _textNameController.clear();
@@ -44,7 +44,7 @@ class _DrawingPageState extends State<DrawingPage> {
         home: Scaffold(
       appBar: AppBar(
           title: const Text("Graph",
-              style: TextStyle(fontSize: 35, color: Colors.white)),
+              style: TextStyle(fontSize: 30, color: Colors.white)),
           toolbarHeight: 110, // Set this height
           flexibleSpace: Container(
             color: Colors.blue,
@@ -62,18 +62,20 @@ class _DrawingPageState extends State<DrawingPage> {
               ]),
               addSpaceH(3),
               Row(children: [
-                addSpaceW(screenSize / 4 - 20),
-                createInputBox("Destination number", screenSize / 4 - 5,
-                    Icons.fiber_manual_record, _textDistController),
-                //addSpaceW(4),
-                createInputBox("Input length", screenSize / 4 - 5,
+                addSpaceW(screenSize / 8 - 4),
+                createButton("\nAdd path\n", addPathPushed),
+                createInputBox("Input length", screenSize / 4 - 25,
                     Icons.arrow_right_alt_outlined, _textLnthController),
+                addSpaceW(13),
+                createButton("\nDel path\n", delPathPushed),
+                createInputBox("Destination number", screenSize / 4 - 25,
+                    Icons.fiber_manual_record, _textDestController),
               ]),
             ]),
           ),
           actions: [
             IconButton(
-              onPressed: flushData,
+              onPressed: clearScreen,
               icon: const Icon(Icons.delete_sweep),
               iconSize: 60,
             ),
@@ -85,8 +87,8 @@ class _DrawingPageState extends State<DrawingPage> {
           child: ButtonBar(
             mainAxisSize: MainAxisSize.min,
             children: <Widget>[
-              createButton("Hello", () {}),
-              createButton("Hi", () {}),
+              createButton("Save to file", () {}),
+              createButton("Load from file", fileOpener),
             ],
           ),
         ),
@@ -148,7 +150,30 @@ class _DrawingPageState extends State<DrawingPage> {
         showPopUp("Error", res);
       }
     }
-    //print(_textNameController.text);
+    clearTextControllers();
+  }
+
+  void addPathPushed() {
+    if (_textDestController.text == "") {
+      showPopUp("Error", "No name in \"Dot name\" box");
+    } else {
+      String? res = data.addIsolated(_textNameController.text);
+      if (res != null) {
+        showPopUp("Error", res);
+      }
+    }
+    clearTextControllers();
+  }
+
+  void delPathPushed() {
+    if (_textDestController.text == "") {
+      showPopUp("Error", "No name in \"Dot name\" box");
+    } else {
+      String? res = data.addIsolated(_textNameController.text);
+      if (res != null) {
+        showPopUp("Error", res);
+      }
+    }
     clearTextControllers();
   }
 
@@ -172,7 +197,7 @@ class _DrawingPageState extends State<DrawingPage> {
   void addLenPushed() {
     //data.delDot()
     print(
-        "${_textNumbController.text} -> ${_textDistController.text} = ${_textLnthController.text}");
+        "${_textNumbController.text} -> ${_textDestController.text} = ${_textLnthController.text}");
     clearTextControllers();
   }
 
@@ -190,11 +215,17 @@ class _DrawingPageState extends State<DrawingPage> {
         ),
       );
 
-  void flushData() {
-    /*if (Platform.isWindows) {
-      exit(0);
+  void fileOpener() async {
+    FilePickerResult? result = await FilePicker.platform.pickFiles();
+
+    if (result != null) {
+      print(result.files.single.path!);
+      data.replaceDataFromFile(result.files.single.path!);
+    } else {
+      showPopUp("Error", "No file selected");
+      // User canceled the picker
     }
-    SystemChannels.platform.invokeMethod('SystemNavigator.pop');*/
-    data.flushData();
   }
+
+  void clearScreen() => data.flushData();
 }
diff --git a/flutter/pubspec.lock b/flutter/pubspec.lock
index 98a9221..2694ab6 100644
--- a/flutter/pubspec.lock
+++ b/flutter/pubspec.lock
@@ -57,6 +57,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.2"
+  file_picker:
+    dependency: "direct main"
+    description:
+      name: file_picker
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -69,11 +83,30 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.4"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.4"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.3"
   lints:
     dependency: transitive
     description:
@@ -102,6 +135,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -162,6 +202,7 @@ packages:
       name: vector_math
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.1"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.15.0-178.1.beta <3.0.0"
+  dart: ">=2.15.0-100.0.dev <3.0.0"
+  flutter: ">=2.0.0"
diff --git a/flutter/pubspec.yaml b/flutter/pubspec.yaml
index 2ed0e18..3c41b83 100644
--- a/flutter/pubspec.yaml
+++ b/flutter/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.15.0-178.1.beta<3.0.0"
+  sdk: ">=2.15.0-100.0.dev<3.0.0"
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
@@ -29,7 +29,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
-
+  file_picker: ^4.2.0
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.