func uploadData() {
    let username = username_textfield.text!
    let password = password_textfield.text!

    let sourceURL = try! FileManager.default
        .url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
        .appendingPathComponent("cropsapdb_up_\(useridsaved).zip")

    let zipData = try! Data(contentsOf: sourceURL)

    let parameters = [
        "unm2": username,
        "pass2": password,
        "ufile": sourceURL.path
    ]

    Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append( zipData, withName: "cropsapdb_up_\(self.useridsaved)", fileName: "cropsapdb_up_\(self.useridsaved).zip", mimeType: "application/zip")
        for (key, value) in parameters {
            multipartFormData.append(value.data(using: .utf8)!, withName: key)
        }
    }, to: "myurl", method: .post) { result in
        switch result{
        case .success(let upload, _, _):
            upload.responseJSON { response in
                switch response.result {
                case .success(let value):
                    print("Parsed JSON:", value)
                case .failure(let error):
                    print("Response error:", error)
                }
            }
        case .failure(let error):
            print("Error preparing upload: \(error.localizedDescription)")
        }
    }
}