Vizio 5.1 connected to TCL Roku Tv Suggestions

I am new and wondering if this could be causing my sync issues.
I have a Vizio 5.1 Surround Sound connected through the ARC HDMI port of a TCL Roku TV.

Is there anything I need to know or do to ensure this is not causing my audio syncing problems with my local content (MP4 movies I had already)

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Please do not double post. You already have a thread open about this issue here: Audio video not syncing