If you’re editing the Customizer > Header > Logo options and uploading an image, but not seeing the changes being made, it’s likely that particular page is either overriding the logo image in its settings, or overriding the entire header with a Global section Header.
There are 2 possible causes:
To check if this is the case, access the particular page in Edit mode and look for the “Header” tab options eg: https://d.pr/i/jgW6LR . If the page was built with Elementor, you can check these options in Page settings > Page header settings eg: https://d.pr/i/278778 .
To check if this is the case, access the particular page in Edit mode and look for the “Header” tab options, but look for the Header layout list https://d.pr/i/ms4a23 and check if there’s a custom one selected, other than “- Select -“.
If there’s a custom one selected, remember its name and access Rey theme > Global Sections and locate that particular one. Open with Elementor.
Here, you can click the Logo element and see if the option called “Override settings” is set eg: https://d.pr/i/N3ruI1 . You can change the logo image here, or disable the option.