File Picker png format images is giving issues - flutter

Question

I was using ImagePicker in my application to select and upload images, but it recently started giving me errors, and constantly glitches when selecting png format images.
For this reason I switched to File picker. But it only works somewhat, and my application still gets stuck. I can only see its display, the image unfortunately does not get stored in the backend (jpg and jpeg images work fine).
Here is the image picker code (if there is a workaround uploading png images using this package, it would be much appreciated):
final ImagePicker _picker = ImagePicker();
Future imageSelectorGallery() async {
var image = (await _picker.pickImage(
source: ImageSource.gallery,
));
if (image != null) {
Uint8List imageBytes = await image
.readAsBytes(); // A fixed-length list of 8-bit unsigned integers which is the file read as bytes
String baseimage = base64Encode(imageBytes);
if (mounted) setState(() {});
post = baseimage;
Navigator.push(context,MaterialPageRoute(builder: (context) => CreatePosts(post,user,caption,upvotes)));
}
}
Here is the file picker code which I have implemented, any help figuring out the error here would also be appreciated:
Future imageSelectorGallery() async {
FilePickerResult? image = await FilePicker.platform.pickFiles(
type: FileType.custom,
allowedExtensions: ['jpg', 'jpeg', 'png', 'gif'],
);
if (image != null) {
Uint8List? imageBytes = image.files.first.bytes;
String baseimage = base64Encode(imageBytes!);
if (mounted) setState(() {});
post = baseimage;
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => CreatePosts(post, user, caption, upvotes)));
} else {
print("File picker error");
}
}
The image is displayed using:
child: Container(
height:
MediaQuery.of(context).size.height / 4.3,
width: MediaQuery.of(context).size.width / 3.4,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30),
image: DecorationImage(
fit: BoxFit.cover,
image: Image.memory(
_bytesImage,
gaplessPlayback: true,
).image,
))),
),