Strength training works by creating microscopic tears in the muscle fibers, which then grow back stronger. But it takes time for this to happen, and most experts recommend resting 48-72 hours between strength training sessions, which implies just 2-3 ST sessions per week. So for example, Mon, Wed, Fri would be fine, but Tues, Wed, Sat wouldn't give you 48 hours between ST sessions. It is fine however to do cardio on a ST rest day (cardio works the muscle in a very different way).
When it comes to ST, doing more is not really better. The main dimension of quality of an ST workout is how challenging it is - the heavier and more challenging each rep is, the better. So repeating a video isn't really much benefit. If you feel you can do more, I'd recommend a different video entirely, so that you work a different collection of muscles.
But I notice you mention upper body and core videos, but make no mention of lower body. The lower body muscles are the largest and strongest in the body, and will give you the most bang for your ST buck. They should definitely not be omitted. Your ST program should definitely work each of upper body, lower body and core, before you consider repeating a muscle group.
While it isn't wrong to do different muscle groups in the morning or evening, it is probably better to do them together:
1. You don't have to remember what videos you did when to ensure your muscles get 48, rather than just 36 hours rest.
2. As you are already warmed up, it is probably more time efficient to do them all at once.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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