Correct Logo Sizes: 
logo-player.png 
main-logo.png
footer-logo.png
953 × 257

Correct Background Sizes:
blue-background-img.jpg
bottom-bg-img.jpg
review-background-img.jpg
1920 x 1080
Ive used the same image for all 3 backgrounds.

All images must have these names when uploading from panel or it will fail.

Panel will fail to upload images if permissions are not properly set. All Images and admin folder set permissions on your VPS to 777. Can change back to 755 later but 777 I have no issues. IF PERMISSIONS ARE NOT PROPERLY SET, CHANGES IN THE ADMIN PANEL WILL NOT WORK. 

Keep in mind that photos are automatically saved in your browsers cache! You will not see changes unless you clear cache or make sure you are uploading using private browser/incognito mode. 

Username:admin
Password:admin123
