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Level 7

After factory reset on our Onn TV, still can't Galaxy Tab a tablet to screen mirror to the TV.

After doing a factory reset on our Onn TV, I still can't get my Galaxy Tab a tablet to connect or screen mirror to the TV.  I can do it when I download the app on my tablet but it won't allow me to cast movies or anything other than a picture or a video clip that I have on the tablet. How can I screen mirror my Galaxy Tab a to the TV when the tablet icon is not on the TV anymore? When we first bought the TV I was able to screen mirror my tablet onto the TV, but something happened I believe after an update occurred. I am not sure exactly but at some point my tablet will not screen mirror to the TV anymore. Does anybody have any ideas?

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