Document max-attachment-size option

Author: limbonaut

docs/platforms/godot/configuration/options.mdx

@@ -108,6 +108,16 @@ If enabled, the SDK will capture and attach scene tree information to events. Th
 
 </ConfigKey>
 
+<ConfigKey name="max-attachment-size">
+
+Defines the maximum size of each attachment in bytes that can be sent with an event. If an attachment exceeds this size, it will be dropped. The default is 20MiB. Please also check the [maximum attachment size of Relay](/product/relay/options/) to make sure your attachments don't get discarded there.
+
+<Alert title="Note">
+This option is currently only effective on Android.
+</Alert>
+
+</ConfigKey>
+
 ## Error Logger Options
 
 <ConfigKey name="logger-enabled">