Request Entitly Too Large

Hi-
I have a page on my website where I’ve added over 200 images. When I try to save it, I get this error message: Request Entity Too Large
The requested resource does not allow request data with POST requests, or the amount of data provided in the request exceeds the capacity limit

I spoke with my hosting company and they say I need to increase my memory in the theme’s functions.php file. I’ve tried doing that but it doesn’t appear to be working. Is there any custom CSS or something that I can add to be able to save this page? I also have Add to Cart coding under each photo that is not showing up on this page. However I’ve created a test page with only 10 images and the same coding and the button appears to work. So I’m assuming this is related to the page size.

Any help would be appreciated! We’re on hold until I can get this issue resolved.

Thanks!
Erin