Migration Series: Handling Assets

[@hassanserranosaade6428]

Thanks for the explanation. Do you plan to cover using the update migration api? I mean, do I have to recreate assets for all the fetched documents that I want to update before migrating them up? Feels a bit silly. For now the update keeps failing because it says response: 'Assets with following ids not found: ZONDDRIAACgA0NNF,ZONDDhIAACgA0NNN,ZONDDhIAACgA0NNO' While these come from fetching the document with the getByUID.