Customers can now upload multiple media files via API.

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Instead of add_backup_recor you need to make /add_media request with merge_asset=true param.

curl -X POST http://localhost:3000/api/job/add_media -d 'asset_ids[]=asset_id' -d 'asset_ids[]=asset_id_2' -d 'merge_assets=true' -d 'api_token=token' -d 'v=4' -d 'job_id=1111'

All info about API you can be found here https://verbitv4test.docs.apiary.io/#​