diff --git a/lib/controllers/share.js b/lib/controllers/share.js
index d19e4ca..9eb698d 100644
--- a/lib/controllers/share.js
+++ b/lib/controllers/share.js
@@ -83,6 +83,7 @@ function S3(serviceOptions) {
     } else {
         var aws = require('aws-sdk');
         aws.config.update({
+            endpoint: serviceOptions.endpoint ?? undefined,
             region: serviceOptions.region
         });
         // if no credentials provided, we assume that they're being provided as environment variables or in a file
diff --git a/serverconfig.json.example b/serverconfig.json.example
index 8576a14..d55894e 100644
--- a/serverconfig.json.example
+++ b/serverconfig.json.example
@@ -141,6 +141,9 @@
             // Required: an existing S3 bucket in which to store objects
             "bucket": "terria-sharedata"
 
+            // Optional: pass through custom S3 endpoint which will utilise the above region.
+            "endpoint": "https://{region}.your.custom.s3.endpoint.com",
+
             // Optional: The access key ID and secret access key of a user with S3 getObject and putObject permission on the above bucket
             // If not provided here, you must ensure they're available as environment variables or in a shared credentials file.
             // See http://docs.aws.amazon.com/AWSJavaScriptSDK/guide/node-configuring.html