diff --git a/quic/interop/inspect-multiplexing.sh b/quic/interop/inspect-multiplexing.sh
index d31ced7b3..39501d218 100755
--- a/quic/interop/inspect-multiplexing.sh
+++ b/quic/interop/inspect-multiplexing.sh
@@ -29,6 +29,11 @@ if [[ -z "$CASE_DIR" ]]; then
 fi
 echo "==> case dir: $CASE_DIR"
 
+echo
+echo "=============== file tree under case dir ==============="
+find "$CASE_DIR" -maxdepth 4 -type f -printf '%s\t%p\n' 2>/dev/null \
+    || find "$CASE_DIR" -maxdepth 4 -type f -exec ls -l {} + 2>/dev/null
+
 echo
 echo "=============== client/log.txt (tail) ==============="
 tail -n 200 "$CASE_DIR"/client/log.txt 2>/dev/null \