diff --git a/app/web/admin/hooks/useRequestWorkspace.js b/app/web/admin/hooks/useRequestWorkspace.js
index 59955aa..570a7bb 100644
--- a/app/web/admin/hooks/useRequestWorkspace.js
+++ b/app/web/admin/hooks/useRequestWorkspace.js
@@ -1,5 +1,22 @@
 import { createRequestModalState } from "../shared/state.js";
 
+async function buildStorageUploadError(response, fallbackMessage) {
+  const base = String(fallbackMessage || "Не удалось загрузить файл в хранилище");
+  const status = Number(response?.status || 0);
+  const statusText = String(response?.statusText || "").trim();
+  let details = "";
+  try {
+    details = String((await response.text()) || "").replace(/\s+/g, " ").trim();
+  } catch (_) {
+    details = "";
+  }
+  if (details.length > 180) details = details.slice(0, 180) + "...";
+  const parts = [];
+  if (status > 0) parts.push("HTTP " + status + (statusText ? " " + statusText : ""));
+  if (details) parts.push(details);
+  return parts.length ? base + " (" + parts.join("; ") + ")" : base;
+}
+
 export function useRequestWorkspace(options) {
   const { useCallback, useRef, useState } = React;
   const opts = options || {};
@@ -247,7 +264,7 @@ export function useRequestWorkspace(options) {
             headers: { "Content-Type": mimeType },
             body: file,
           });
-          if (!putResp.ok) throw new Error("Не удалось загрузить файл в хранилище");
+          if (!putResp.ok) throw new Error(await buildStorageUploadError(putResp, "Не удалось загрузить файл в хранилище"));
           await api("/api/admin/uploads/complete", {
             method: "POST",
             body: {
@@ -413,7 +430,7 @@ export function useRequestWorkspace(options) {
             headers: { "Content-Type": mimeType },
             body: file,
           });
-          if (!putResp.ok) throw new Error("Не удалось загрузить файл в хранилище");
+          if (!putResp.ok) throw new Error(await buildStorageUploadError(putResp, "Не удалось загрузить файл в хранилище"));
           await api("/api/admin/uploads/complete", {
             method: "POST",
             body: {
diff --git a/app/web/client.jsx b/app/web/client.jsx
index e516a43..0947839 100644
--- a/app/web/client.jsx
+++ b/app/web/client.jsx
@@ -370,6 +370,23 @@ import { detectAttachmentPreviewKind, fmtShortDateTime } from "./admin/shared/ut
       return data;
     }, []);
 
+    const buildStorageUploadError = useCallback(async (response, fallbackMessage) => {
+      const base = String(fallbackMessage || "Ошибка передачи файла в хранилище");
+      const status = Number(response?.status || 0);
+      const statusText = String(response?.statusText || "").trim();
+      let details = "";
+      try {
+        details = String((await response.text()) || "").replace(/\s+/g, " ").trim();
+      } catch (_) {
+        details = "";
+      }
+      if (details.length > 180) details = details.slice(0, 180) + "...";
+      const parts = [];
+      if (status > 0) parts.push("HTTP " + status + (statusText ? " " + statusText : ""));
+      if (details) parts.push(details);
+      return parts.length ? base + " (" + parts.join("; ") + ")" : base;
+    }, []);
+
     const uploadPublicRequestAttachment = useCallback(async (file, extra = {}) => {
       const requestId = String(requestModal.requestId || "").trim();
       if (!requestId) throw new Error("Не выбрана заявка");
@@ -394,7 +411,7 @@ import { detectAttachmentPreviewKind, fmtShortDateTime } from "./admin/shared/ut
         headers: { "Content-Type": mimeType },
         body: file,
       });
-      if (!putResponse.ok) throw new Error("Ошибка передачи файла в хранилище");
+      if (!putResponse.ok) throw new Error(await buildStorageUploadError(putResponse, "Ошибка передачи файла в хранилище"));
       const completeData = await apiJson(
         "/api/public/uploads/complete",
         {
@@ -413,7 +430,7 @@ import { detectAttachmentPreviewKind, fmtShortDateTime } from "./admin/shared/ut
         "Не удалось завершить загрузку файла"
       );
       return completeData;
-    }, [apiJson, requestModal.requestId]);
+    }, [apiJson, buildStorageUploadError, requestModal.requestId]);
 
     const loadRequestWorkspace = useCallback(
       async (trackNumber, showLoading) => {
diff --git a/frontend/nginx.conf b/frontend/nginx.conf
index 5a81189..a2a5355 100644
--- a/frontend/nginx.conf
+++ b/frontend/nginx.conf
@@ -3,6 +3,7 @@ server {
     server_name _;
     server_tokens off;
     absolute_redirect off;
+    client_max_body_size 25m;
 
     root /usr/share/nginx/html;
     index index.html;
@@ -94,6 +95,8 @@ server {
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_request_buffering off;
+        proxy_buffering off;
     }
 
     location /health {
diff --git a/frontend/nginx.prod.conf b/frontend/nginx.prod.conf
index d462173..eddf330 100644
--- a/frontend/nginx.prod.conf
+++ b/frontend/nginx.prod.conf
@@ -3,6 +3,7 @@ server {
     server_name _;
     server_tokens off;
     absolute_redirect off;
+    client_max_body_size 25m;
 
     root /usr/share/nginx/html;
     index index.html;
@@ -94,6 +95,8 @@ server {
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_request_buffering off;
+        proxy_buffering off;
         proxy_ssl_server_name on;
         proxy_ssl_name minio;
         proxy_ssl_trusted_certificate /etc/nginx/minio-ca.crt;