Change the image pick callback function

app/lib/pages/home_page.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'package:path/path.dart';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
@@ -10,6 +11,7 @@ import 'package:flutter_quill/widgets/controller.dart';
 import 'package:flutter_quill/widgets/default_styles.dart';
 import 'package:flutter_quill/widgets/editor.dart';
 import 'package:flutter_quill/widgets/toolbar.dart';
+import 'package:path_provider/path_provider.dart';
 import 'package:tuple/tuple.dart';
 
 import 'read_only_page.dart';
@@ -125,19 +127,21 @@ class _HomePageState extends State<HomePage> {
         Container(
           child: QuillToolbar.basic(
               controller: _controller,
-              onImagePickCallback: _fakeUploadImageCallBack),
+              onImagePickCallback: _onImagePickCallback),
         )
       ],
     );
   }
 
-  /// Upload the image file to AWS s3 when image is picked
+  // Renders the image picked by imagePicker from local file storage
-  Future<String> _fakeUploadImageCallBack(File file) async {
+  // You can also upload the picked image to any server (eg : AWS s3 or Firebase) and then return the uploaded image URL
-    print(file);
+  Future<String> _onImagePickCallback(File file) async {
-    var completer = new Completer<String>();
+    if (file == null) return null;
-    completer.complete(
+    // Copies the picked file from temporary cache to applications directory
-        'https://user-images.githubusercontent.com/122956/72955931-ccc07900-3d52-11ea-89b1-d468a6e2aa2b.png');
+    Directory appDocDir = await getApplicationDocumentsDirectory();
-    return completer.future;
+    File copiedFile =
+        await file.copy('${appDocDir.path}/${basename(file.path)}');
+    return copiedFile.path.toString();
   }
 
   Widget _buildMenuBar(BuildContext context) {

app/pubspec.lock

@@ -78,6 +78,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0-nullsafety.1"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.3"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.2.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -149,6 +163,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.1"
+  intl:
+    dependency: transitive
+    description:
+      name: intl
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.16.1"
   matcher:
     dependency: transitive
     description:
@@ -170,6 +191,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0-nullsafety.1"
+  path_provider:
+    dependency: "direct main"
+    description:
+      name: path_provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.6.27"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.1+2"
+  path_provider_macos:
+    dependency: transitive
+    description:
+      name: path_provider_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4+8"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4+3"
   pedantic:
     dependency: transitive
     description:
@@ -184,6 +240,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.10.3"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.1"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -191,6 +254,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.3"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.13"
   quill_delta:
     dependency: transitive
     description:
@@ -336,6 +406,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0-nullsafety.3"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.4+1"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.2"
   zone_local:
     dependency: transitive
     description:

app/pubspec.yaml

@@ -28,6 +28,7 @@ dependencies:
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.0
+  path_provider: ^1.6.27
   flutter_quill:
     path: ../