Split option not working in first or last second of the track

I'm trying to see if Replay will be a viable option for my team to use for screen recording and editing simple videos of math equations being solved. When the screen recording track is added, the "Split" option is not available (grayed out)within the first and last 1.000 seconds of the track. If I split the track, then this same limitation applies to the split sections.  Please advise.

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