There is a problem converting the unint8list image in Flutter - flutter

Question

I am working on uploading the uint8List type image to Firestore and get it again.
I have converted to String to upload to Firestore.
Future _pageDrawScreen() async {
// screenshot pakage
Uint8List? _previewImage = await _testController.capture(); // get uint8List image data
if (_previewImage == null) {
logger.d("_previewImage null");
}
// convert to String
_pageModel!.previewImage = _previewImage.toString();
// Firestore update
}
Then, I take the image data again, convert it, and output it as a memory image.
Widget _pageContainer(int index, PageModel pageModel) {
// get image and convert
Uint8List? previewImage;
if (pageModel.previewImage != null) {
List<int> list = pageModel.previewImage!.codeUnits;
previewImage = Uint8List.fromList(list);
// logger.d(previewImage);
}
return ListTile(
title: pageModel.previewImage != null
? ExtendedImage.memory(
previewImage!,// error!
width: 125,
height: 125,
fit: BoxFit.cover,
// check image state
loadStateChanged: (state) {
switch (state.extendedImageLoadState) {
case LoadState.loading:
return const SizedBox(
width: 50,
height: 50,
child: CircularProgressIndicator(
color: Colors.red,
),
);
case LoadState.completed:
return null;
// Failed error!!
case LoadState.failed:
return const Material(
color: Colors.white,
child: Icon(
Icons.cancel,
color: Colors.red,
size: 50,
),
);
}
},
)
: Container(
width: 125,
height: 125,
color: Colors.white,
child: const Center(
child: CircularProgressIndicator(),
),
),
);
}
However, this image is checked as an error state. Is the conversion of Uint8List wrong?
Expected Results (When using the uint8list image as it is,
):
Actual Results:

Answer 1

import
import 'dart:convert';
for uploading
Uint8List? _previewImage = await _testController.capture();
if(_previewImage != null){
String previewImage = base64.encode(_previewImage);
}
after fetching the image data
Uint8List previewImage = base64.decode(previewImage);