Is there a reason my video quality doesnt look as good when i upload a video from my smartphone? Phantom 3 pro

More detail please. Video from the DJI App? Uploaded where ?

I believe the video on your phone will only be in 720p. To make the video into higher quality you have to download the footage from the Phantom to the phone once you've selected the parts you want to make your clip. There is a download icon in the library section of the app.

I was uploading it to Facebook. I downloaded the video from the go app to my phone.

yeah, video on app is only 720p, you need to download the original video from the drone when you're connected to it to get full 1080p or 4k

Facebook is notorious for making any resolution video Muddy in appearance.