DNG native camera lossless compression on import

Hi. I have XP with  LR2.5 and Ps CS4 and ACR 5.5. My camera (Leica M8) produces DNG files as its native format.
I am confused regarding methods to apply lossless compression to these DNG files. I have used this successfully previously but currently am unable to reproduce this function with LR2.
I have lossless compression for DNG set in preferences. I am importing the files from the card and applying a change to the file, for example WB, then selecting update metadata and preview as a workaround. However file sizes do not appear to change.
Since I have opened DNGs in another converter as well as in ACR too I am confused on where the lossless compression has been applied previously.
I have successfully applied this compression with ACR in the past but am trying to learn the LR workflow.
I am also unsure if I can have the lossless compression applied during import.
Any pointers as to what I am now missing would be greatly appreciated.

I don't think that in the workflow you describe there is any possibility for the data to become compressed by Lightroom. Updating metdata in a dng file does not touch the RAW data, so it is normal that the filesize does not change.
I am also unsure if I can have the lossless compression applied during import.
Any pointers as to what I am now missing would be greatly appreciated.
You can set the import pane up to "copy photos as dng". I believe this recompresses the dng but I have never owned a camera that uses dng as its native format so I am not sure about that. Otherwise, you can after import "Convert photo to DNG" from the edit menu. This should also reconvert files that are already dng.

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