Hello @Matt_Chapman,
Good to see you back at our Community forum, we’re sorry that your client saw some of their local files missing upon importing. Can you tell us a bit more about this content, it’s format, how it was organized on the drive? Is the content still present on the Synology and able to be played back? Is there any chance that some of the files were corrupted?
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
There are a number of things that could cause this, the information above will help us take a bird’s eye view at the setup. Thanks!