FOTA download starting offset

I'm using the FOTA download library to download both the nRF9160 app firmware and the cellular firmware.  Since the cellular firmware is so large it's more likely to drop a connection if in a bad cellular area.  Is there a way to start the FOTA download from an offset so I don't have to start over again?  I see no such parameters in the fota_download_start().  

I'm also using the standard download client for a standard https connection, and this one does have the ability to use a starting offset with download_client_start().  Maybe there is a way to use this client with the FOTA library?  If not, are there any other ideas from Nordic?  I'm just trying to find a way to start the download where it left off.

Thanks,

Chris 

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