Help enabling downloads through webview (Kotlin)

Good day. I'm new to android development and I'm trying to develop a simple webview application, picked a nice template and went through the steps and made good progress, I managed to load my site fully and enable javascript, that works as intended, however I'm not able to make the app download anything, I host a few pdf files that should open or download through it, but nothing happens.

I looked at a few answers here and it is to my understanding that I need to specifically add a function for that, could you give me a hand? I have tried multiple different code and tweaking them, but I wasn't able to get it to work, here is my base code:

Code (Text):

1. package com.logista.test.ui.home
2.  
3. import android.os.Bundle
4. import android.view.LayoutInflater
5. import android.view.View
6. import android.view.ViewGroup
7. import android.webkit.WebResourceRequest
8. import android.webkit.WebView
9. import android.webkit.WebViewClient
10. import android.app.DownloadManager
11. import androidx.fragment.app.Fragment
12. import androidx.lifecycle.ViewModelProvider
13. import com.logista.test.R
14.  
15.  
16. class HomeFragment : Fragment() {
17.  
18.     private lateinit var homeViewModel: HomeViewModel
19.  
20.     override fun onCreateView(
21.             inflater: LayoutInflater,
22.             container: ViewGroup?,
23.             savedInstanceState: Bundle?
24.     ): View? {
25.         homeViewModel =
26.                 ViewModelProvider(this).get(HomeViewModel::class.java)
27.         val root = inflater.inflate(R.layout.fragment_home, container, false)
28.         val myWebView: WebView = root.findViewById(R.id.webview)
29.         myWebView.webViewClient = WebViewClient()
30.         myWebView.settings.javaScriptEnabled = true
31.         myWebView.loadUrl("https://www.example.org/")
32.         return root
33.     }
34. }

I believe I should be adding

Code (Text):

1. import android.app.DownloadManager

And tweak this

Code (Text):

1.         // Set web view download listener
2.  
3.         web_view.setDownloadListener(DownloadListener {
4.             url,
5.             userAgent,
6.             contentDescription,
7.             mimetype,
8.             contentLength ->
9.  
10.             // Initialize download request
11.             val request = DownloadManager.Request(Uri.parse(url))
12.  
13.             // Get the cookie
14.             val cookies = CookieManager.getInstance().getCookie(url)
15.  
16.             // Add the download request header
17.             request.addRequestHeader("Cookie",cookies)
18.             request.addRequestHeader("User-Agent",userAgent)
19.  
20.             // Set download request description
21.             request.setDescription("Downloading requested file....")
22.  
23.             // Set download request mime tytpe
24.             request.setMimeType(mimetype)
25.  
26.             // Allow scanning
27.             request.allowScanningByMediaScanner()
28.  
29.             // Download request notification setting
30.             request.setNotificationVisibility(
31.                     DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)
32.  
33.             // Guess the file name
34.             val fileName = URLUtil.guessFileName(url, contentDescription, mimetype)
35.  
36.             // Set a destination storage for downloaded file
37.             request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName)
38.  
39.             // Set request title
40.             request.setTitle(URLUtil.guessFileName(url, contentDescription, mimetype));
41.  
42.  
43.             // DownloadManager request more settings
44.             request.setAllowedOverMetered(true)
45.             request.setAllowedOverRoaming(false)
46.             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
47.                 request.setRequiresCharging(false)
48.                 request.setRequiresDeviceIdle(false)
49.             }
50.             request.setVisibleInDownloadsUi(true)
51.  
52.  
53.             // Get the system download service
54.             val dManager = getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
55.  
56.             // Finally, request the download to system download service
57.             dManager.enqueue(request)
58.         })
59.  
60.  
61.         // Load button click listener
62.         button_load.setOnClickListener{
63.             // Load url in a web view
64.             web_view.loadUrl(url)
65.         }
66.  
67.     }

Taken from here: https://android--code.blogspot.com/2018/03/android-kotlin-webview-file-download.html

I did the basics, renaming the function accordingly and such, but it gives me quite a few errors when building the app, for instance uri isn't defined, cookiemanager isn't defined, environment isn't defined, build isn't defined, and such, could you give me some guidance?