For context, I use Vegas Pro 13 to upload my gameplay videos on my personal Facebook page. I have the resolution of the video set as 1080x1080p for 1:1 aspect ratio as I've seen other pages do the same. Now, whenever I upload my videos the best quality option it gives me is 640p instead of 1080p since the video's resolution was rendered at 1080p and looking at the other pages' videos I see that they have the option for 1080p quality on a 1:1 aspect ratio.

I suspect that this has something to do with my rendering options because how can other pages have the option for 1080p when we both rendered it at 1:1 aspect ratio (1080x1080p). I read somewhere that the quality option "can" (not 100% sure) be increased if I render the video at something like 2048x2048 which would be too large in terms of file size for someone like me who uploads a lot of videos. If anyone knows anything about using Vegas Pro and uploading videos on Facebook, please let me know what render options you're using. Thank you!