You are totally right, AppVersion will not be in v4.x.
You can do that via copy/paste files in FileService:
[FirstApp] - go to FileService
[FirstApp] - click to "media" directory
[FirstApp] - zip "media" directory
[FirstApp] - go to level above (to the Root level)
[FirstApp] - you will see media.zip file
[FirstApp] - download media.zip file
[SecondApp] - go to FileService (Root level)
[SecondApp] - upload media.zip file
[SecondApp] - unzip media.zip file (maybe you should combine/replace existed "media" directory by unzipped dir)
[SecondApp] - go to MediaService and you will see all of your streams (timestamps and publishers should be restored)
http://support.backendless.com/public/attachments/627f996d21d392244a37a86b315f9b83.jpg</img>
If this is a single occurrence of the problem (meaning you need to do it only once), let us know the app ID of the old app and the app ID of the new app and we can move the files for you.
For now I don’t need, I wanted to do this for a “staging” app I created. I added a workaround so I will get the videos from both folders “media” and “media(1)”.
I will contact you in case I will need this in the future.