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To do so, you need to create a child theme,?For creating a child theme refers to this?link. Ignore if you have already created a child theme.
1? After it Creates a? folder with the name header? and then creates?a header-navbar.php file inside the header folder???and edit it, then paste the code in it from?this link.
2 Again? ?Copy the PHP code from this link? https://pastebin.com/xv2uvkPK?
3? And add the PHP code inside the function.php file of the child theme. See the function.php file snapshot after adding code.https://prnt.sc/ubyt3jSave changes and activate your child theme.
After following the above step you will find an option for the uploading header?image.
Let me know for further assistance.
Thanks?