ImageFields and external storages

Hi,

I am currently bit frusted with ImageField using some kind of external 
storage. FileSystemStorage works basically fine with ImageFields but when 
you copy&paste an object containing such an image field then the content
stored on the the filesystem is not copied over to the new image (making
FileSystemStorage mostly useless). I also tried ExternalStorage which 
absolutely won't work with ImageFields. It fails deep inside OFS/Image
inside a seek() operation (NoneType object has no attribute seek).
Has anyone a working solution using ImageFields where the content is stored
on the filesystem?

Thanks,
Andreas

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