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To upload multiple files with multiple keys using the http package in Flutter using FormData, you can follow the steps below:

1. Import the http package:

import 'package:http/http.dart' as http;

1. Create a FormData object:

FormData formData = FormData();

1. Add each file to the FormData object with a unique key:

formData.files.add(MapEntry(
    "file1", await MultipartFile.fromPath("file1", filePath1)));
formData.files.add(MapEntry(
    "file2", await MultipartFile.fromPath("file2", filePath2)));

1. Add any other key-value pairs to the FormData object as needed:

formData.fields.add(MapEntry("key1", value1));
formData.fields.add(MapEntry("key2", value2));

1. Send the post request with the FormData object:

var response = await http.post(url, body: formData);

This should upload multiple files with multiple keys using the http package in Flutter using FormData.