diff --git a/Caddyfile b/Caddyfile
index 77d0ccc..57e69e5 100644
--- a/Caddyfile
+++ b/Caddyfile
@@ -181,7 +181,6 @@ files.hubris.network {
 		dns ionos {env.IONOS_AUTH_API_TOKEN}
 	}
 	encode zstd gzip
-	# Seafile desktop client uploads large files; bump the body cap.
 	request_body {
 		max_size 10GB
 	}
@@ -189,5 +188,18 @@ files.hubris.network {
 		header_up X-Forwarded-Proto https
 		header_up X-Forwarded-Host {host}
 		header_up Host {host}
+		# Seafile iOS Pro app (>=4.0) speaks the IETF Resumable Uploads draft;
+		# the bundled seafile-fileserver does not. Strip the negotiation headers
+		# so the client falls back to a normal multipart upload.
+		header_up -Upload-Draft-Interop-Version
+		header_up -Upload-Complete
+		header_up -Upload-Offset
+		header_up -Upload-Length
+		transport http {
+			dial_timeout 30s
+			read_timeout 1h
+			write_timeout 1h
+		}
+		flush_interval -1
 	}
 }