My iPhone 7plus is not making sounds and not playing my videos on my photos

anjola ~ Although you haven't answered my question: "Does your iPhone 7 Plus still have its original battery?", your iPhone 7 Plus' maximum capacity of 98% implies that the answer is "No." Capacity typically declines by 1-2%/month, so an original 5½ year-old battery should have declined by more than the 2% yours indicates.

So was the battery replaced by a qualified technician using a genuine iPhone battery?...

About genuine iPhone batteries

Repair Provider Verification - Official Apple Support

...If not, the non-genuine iPhone battery could be the explanation for your iPhone 7 Plus not making sounds, not playing videos, etc.

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anjola ~ Does your iPhone 7 Plus still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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