It doesnt matter what app you use for this, as long as it supports exporting in 4K.
Check YouTubes list of supported file formats before you upload.
If yours isnt on the list, convert it before you upload.

If you dont have a video editing app, you’re able to use afree video converter.
Locate and select your 4K video, and clickOpen.
Enter atitleanddescription, then scroll down.

Adjust the audience options if necessary, then clickNext.
If YouTube has detected any copyright flags on your video by this point, theyll appear on this screen.
ClickPublicif you want the video to be publicly available.

Leave the window open while the video uploads.
When the video is done uploading, youll see a message that its processing.
you could kill the window now, or leave it open for a visual indication of the processing time.

You also need to verify your YouTube account though, if you want to upload long videos.
To verify a YouTube account, you need a phone number where you could receive calls or text messages.
What Are the Best Export tweaks for 4K YouTube Videos?

For example, YouTube recommends the MP4 format, the H.264 video codec, and the AAC-LC audio codec.
Sticking as close as possible to the recommended YouTube configs decreases the likelihood of running into any problems.
YouTube maintains a list of the recommended 4K tweaks.

FAQ
it’s possible for you to only stream videos in 4K if your unit supports it.
Todownload YouTube videos, you need a YouTube Premium subscription.
SelectDownloadunder any YouTube video.

Downloaded videos can be accessed offline through theDownloadstab.




