Adds note about max upload size

Author: angelampcosta

src/content/docs/support/troubleshooting/http-status-codes/4xx-client-error/error-413.mdx

@@ -22,4 +22,6 @@ The upload limit for the Cloudflare API depends on your plan. If you exceed this
 
 <FeatureTable id="network.max_upload_size" />
 
+Keep in mind, customers can reduce the **Maximum Upload Size** from the zone's **Network** page which can cause a `413`.
+
 If you require a larger upload, break up requests into smaller chunks, change your DNS record to [DNS-only](/dns/proxy-status/#dns-only-records), or [upgrade your plan](/billing/change-plan/).