Instead of AssetImage string for defaultImage, use ImageProvider.

Provides more options

Author: danvick

example/lib/main.dart

@@ -452,6 +452,7 @@ class MyHomePageState extends State<MyHomePage> {
                     decoration: const InputDecoration(
                       labelText: 'Images',
                     ),
+                    defaultImage: NetworkImage('https://cohenwoodworking.com/wp-content/uploads/2016/09/image-placeholder-500x500.jpg'),
                     maxImages: 3,
                     iconColor: Colors.red,
                     // readOnly: true,

lib/src/fields/form_builder_image_picker.dart

@@ -39,7 +39,7 @@ class FormBuilderImagePicker extends StatefulWidget {
   final CameraDevice preferredCameraDevice;
 
   final int maxImages;
-  final String defaultImage;
+  final ImageProvider defaultImage;
   final Widget cameraIcon;
   final Widget galleryIcon;
   final Widget cameraLabel;
@@ -195,7 +195,7 @@ class _FormBuilderImagePickerState extends State<FormBuilderImagePicker> {
                         Image(
                           width: widget.imageWidth,
                           height: widget.imageHeight,
-                          image: AssetImage(widget.defaultImage),
+                          image: widget.defaultImage,
                         ):Container(
                           width: widget.imageWidth,
                           height: widget.imageHeight,