Very confused on proper usage of Asset Bundles

Hello folks,

I'm starting to develop the whole "asset bundle management" thing. And I already caught several doubts.
My user is supposed to choose from a list any level he wishes. If that level exists, download, load and play it. The documentation doesn't seem to cover the entire process, that's why I have doubts on how to proceed.

What I got so far:

Code (CSharp):

1. public class AssetBundleWebLoader : MonoBehaviour
2. {
3.     IEnumerator LoadBundle(string bundleUrl, string assetName)
4.     {
5.         using (UnityWebRequest www = UnityWebRequestAssetBundle.GetAssetBundle(bundleUrl))
6.         {
7.             yield return www.SendWebRequest();
8.             if (www.isNetworkError || www.isHttpError)
9.             {
10.                 Debug.Log(www.error);
11.             }
12.             else
13.             {
14.                 AssetBundle bundle = DownloadHandlerAssetBundle.GetContent(www);
15.                 // Is this correct to check if the download is complete?
16.                 if (www.downloadProgress >= 1.0f)
17.                 {
18.                     //bundle.LoadAllAssets(); // Perhaps don't load EVERYTHING here.
19.                 }
20.             }
21.         }
22.     }
23. }

Download a bundle from a URL. Fine.

1. On the last line, I am downloading the bundle. How do I check if the bundle has been fully downloaded so I can deploy it?
2. Can I let the user keep the bundle in memory so he doesn't have to download it again after he reboots the game? How?
3. If the bundle consists in a single scene, every 3D object, material and stuff will be included in the bundle. EXCEPT for scripts that were not included in the original build. Am I correct?
4. If I mark a folder as Asset Bundle, will everything inside become part of the bundle?

I think I will add more questions the more I work on it.

Thanks in advance for the help.

 

This is the part in the documentation I don't understand. Because:

Code (CSharp):

1. public static Networking.UnityWebRequest GetAssetBundle(string uri, uint version, uint crc);

Look like WWW.LoadFromCacheOrDownload: check if it is in the cache, if it is not, download it. But, as far as I understand, it goes in the cache. Will it be deleted on the next reboot?

Code (CSharp):

1. public static Networking.UnityWebRequest GetAssetBundle(string uri, CachedAssetBundle cachedAssetBundle, uint crc);

Is the same but you are allowed to specify a cache path. Again, deleted on the reboot?

Thanks for the reply.