Hello ! I have several EAP 245 and a Omada Controller 4.4.6 on Raspberry pi 4. I was going to set up a portal, but a nice picture. But then, I keep getting an error message, that the picture has to be smaller than 2MB. But I reduced and reduced and it's about 600KB now, I still get the same message. I would appreciate if someone could please tell me what is causing this.

p.s. the error message shows up when I click "Apply". When I click "Choose" and choose the pic, it says "upload succeeded".