I'm unable to upload 4K videos to Vegas Pro 11. At first I tried HEVC codec with no luck, and then converted them to H264 codec using Avidemux. Still, however, the videos refuse to upload. Internet suggest using Handbrake, but I see no option for 4K quality in it, hence I can't use it. All .mp4 files from the same camera in lower quality work just fine, but 4K .mp4 videos do not. I do not want to lost quality in editing. Please help.
These are the stats for the original video:
And these are the stats for the video after being edited with Avidemux:
Neither of these open in Vegas Pro 11.