Doubt about new partition for movies

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Not sure I'd create it anywhere. I'd adjust your expectations for media. Honestly, 3 TB (or TiB? If I'm reading correctly) isn't much for media. If you're already filling that up, an extra 128 GB isn't going to take you far. Highly recommend you leave the OS drive strictly for the OS and find a way to get more storage or start transcoding your media to a more suitable format.

I thought I would never fill up my drives and now I'm at 17.5/18 TB with two new 14 TB drives going in soon. I wouldn't mess with using your very small SSD for media storage for a number of reasons, most of all because a 128 GB OS space could easily fill up and put you in a tough spot.