New to linking GCS with label studio

I successfully annotated videos using Label Studio, but that was when I was loading in the .mp4 files from local. I am trying to connect to a Google Cloud bucket. Unfortunately, though it loads the videos (I created a dummy test folder with only three videos of various sizes) as tasks, it cannot display them and gives me:

Error: There has been an error rendering your video, please check the format is supported.

I confirmed that when I load a file directly from my hard drive, it works fine.

What am I missing in terms of getting Label-studio to load in videos from Google Cloud for annotation? I'm new to using this type of service. I own the google cloud account outright so have complete access to all files.

I am using the following labeling code:

My CORS config:

The error:

Linking Google Cloud:

Google Cloud Bucket:

Label-studio project screen: