diff --git a/host-stacks/vds-kzntsv/mappa.compose.yml b/host-stacks/vds-kzntsv/mappa.compose.yml
index 21b0761..44b3c11 100644
--- a/host-stacks/vds-kzntsv/mappa.compose.yml
+++ b/host-stacks/vds-kzntsv/mappa.compose.yml
@@ -27,6 +27,14 @@ services:
       # env 10/10; согласовано с mappa: latest=0.2.0, min=0.1.0 (inbox:3372/3380)
       MAPPA_CLIENT_LATEST: ${MAPPA_CLIENT_LATEST}
       MAPPA_CLIENT_MIN: ${MAPPA_CLIENT_MIN}
+      # S3-бэкенд blob attachment (task:2123, wiki:3435/3309): MinIO mappa-attachments
+      # декларация обязательна — Portainer env-массив транслирует только её (gotcha v0.55.1)
+      MAPPA_ATTACHMENT_BACKEND: ${MAPPA_ATTACHMENT_BACKEND}
+      MAPPA_S3_ENDPOINT: ${MAPPA_S3_ENDPOINT}
+      MAPPA_S3_BUCKET: ${MAPPA_S3_BUCKET}
+      MAPPA_S3_REGION: ${MAPPA_S3_REGION}
+      MAPPA_S3_ACCESS_KEY: ${MAPPA_S3_ACCESS_KEY}
+      MAPPA_S3_SECRET_KEY: ${MAPPA_S3_SECRET_KEY}
     volumes:
       # git-бэкап (task:1430): каталог экспорта = рабочая копия vds-mappa-backup на хосте
       - /root/vds-mappa-backup:/backup