WinWazzapMigrator is able to migrate WhatsApp media in addition to the messages: pictures, videos, contacts, GPS positions, voice notes.

You need to copy the following WhatsApp media folders from Windows Phone, usually

Phone\Pictures\WhatsApp

Phone\Users\DefApps\AppData\Local\Packages\5319275A.WhatsApp_cv1g1gvanyjgm\LocalState\shared\transfers

Phone\Data\USERS\DefApps\APPDATA\Local\Packages\5319275A.WhatsApp_cv1g1gvanyjgm\LocalState\Shared\Transfers

Phone\Data\Users\Public\Pictures\WhatsApp

Phone\Data\Users\Public\Pictures\Camera Roll

Please note that this is a list of the folders where you could find WhatsApp media files. Each Windows Phone can have some or all of these folders, so don't worry if you can't find all of them. You need to copy the content of these folders into the WinWazzapMigrator/Media folder on your Android device. You can copy from your PC to Android (with Android File Transfer for Mac or Kies for PC/Mac) or transfer by any other way (Dropbox, Google Drive, etc).

windows do not convert

Please note that if you already migrated your messages you need to perform a brand new migration as Whatsapp needs to be made aware of the new media that will be embedded in your imported conversation. 

You can also select a different Media folder like this:

media folder selection

WhatsApp media folder - option 1
WhatsApp media folder - option 2