Should fat grafting still cause sagging?

I am planning to do fat transplantation on the forehead, temples, and under the eyes.
 
I saw a video on YouTube saying that the forehead has a high engraftment rate and will stand out later, while the rest of the face is dangerous because sagging occurs.
 
According to Bobby Talk or direct consultation, the sagging is not caused by fat transplantation but is caused by aging. Sagging occurs. They say it's okay to do a small amount on the forehead and thinly spread the face. Maybe
 
it's because I have thin ears, but both opinions are correct. It's not easy to make a decision. Is it better to have facial fat transplant?
 
If anyone has tried fat grafting, I would like to hear your review!