'Do I need to modify the app if I connected CloudFront with S3?

So, I have an app with people who can post videos, make a profile etc.

I don't have so much experience with AWS, but I'm confused. I followed a tutorial about "How to connect S3 with CloudFront" and I don't know if I need to do more.

So, on Origin domain I selected my S3 Bucket and on "Allowed HTTP" only GET, HEAD. And the other settings like all edge locations.

My question is, my app still have performance issues, Do I need to modify anything else? Like, when I go to my app and tap on the share button, the share link is s3bucket...... , I didn't change it to my website yet.

mobile-application

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'Do I need to modify the app if I connected CloudFront with S3?

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