Thank you.
How could I setup long cache times?
Ok, so, I resolved it.
For everyone that will come across: Try to upload your SVG to Canva and re-download it. It will modify the SVG a little so it would be accepted by WordPress and Elementor.
The SVG was the problem!
Thank you very much for help!
Hello,
I actually tried to upload svgs unrelated to header/footer through the Media Gallery and it didn’t work.