How do I properly catch errors when doing CRUD operations on firebase?

How do I properly catch errors when doing CRUD operations on firebase?

I turned off the wifi and I was expecting to catch an error snack but all I see is the loader spinning forever and ever.
If I turn the wifi backon, it eventually uploads the files

_uploadImages(context) async {
    setState(() {
      _isLoading = true;
    });
    try {
      List filesList = [];
      var imgCount = await _getImageCountPerJob();
      for (var photo in _imageFileList!) {
        final destination = 'job-images/$jobId/img/img_$imgCount';
        imgCount++;
        final ref = FirebaseStorage.instance.ref(destination);
        var file = File(photo.path);
        await ref.putFile(file);
        var imageUrl = await ref.getDownloadURL();
        filesList.add(imageUrl);
      }
      _cloudFunctions
          .updateJobColumn(
        documentId: jobId,
        fieldNameColumn: jobImagesListColumnt,
        fieldNameColumnValue: filesList,
      )
          .then((value) {
        _displaySnackBarMessage("Success uploading images", context);
        setState(() {
          _imageFileList = [];
        });
      });
    } catch (err) {
      log('error');
      _displaySnackBarMessage("Error uploading images", context);
      setState(() {
        _isLoading = false;
      });
    }

    setState(() {
      _isLoading = false;
    });
  }

  final job = FirebaseFirestore.instance.collection('job');


Future<void> updateJobApplicationColumn({
    required String documentId,
    required String fieldNameColumn,
    required fieldNameColumnValue,
  }) async {
    try {
      await jobApplication.doc(documentId).update({
        fieldNameColumn: fieldNameColumnValue,
      });
    } catch (e) {
      throw CouldNotUpdateJobException();
    }
  }