After I render the video the resolution of the video is decreased, see this video's resolution(when full screen landscape) : https://youtu.be/vRk-wG-HnQw
I don't know if this bug is only on android. Whatever resolution I use, after I render the resolution is decreased.
This is not a problem with YouTube
because After I rec the video, the size is good It's happened after I rendered.
I got the answer from Adobe Care.
I have just bought a year's subscription. I hope this isn't a mistake. The rendering of my 4k 60fps iphone video has been downgraded to a blurry rubbish clip. If this is what rush can do then I would prefer to cancel.