diff --git a/panel/src/i18n/resources/en-US/errors.json b/panel/src/i18n/resources/en-US/errors.json
index 18b1aae..1daf4dc 100644
--- a/panel/src/i18n/resources/en-US/errors.json
+++ b/panel/src/i18n/resources/en-US/errors.json
@@ -67,6 +67,7 @@
   "already_terminal": "This build already finished — there is nothing to cancel.",
   "build_unavailable": "Image builds aren't available right now.",
   "build_logs_unavailable": "Build logs aren't available right now.",
+  "scan_document_not_kept": "This build kept no copy of that scan file: it was too large to keep, or the step that writes it failed.",
   "already_reviewed": "This submission has already been reviewed.",
   "context_changed": "The submitter uploaded the build context again after you reviewed it. Download and review the new upload before approving.",
   "submission_quota_exceeded": "Your submission quota is full: too many pending reviews, or your pending and rejected uploads fill your storage allowance. Withdraw a pending one, or wait: a rejected upload frees its space 7 days after review, and approved ones don't count.",
diff --git a/panel/src/i18n/resources/zh-CN/errors.json b/panel/src/i18n/resources/zh-CN/errors.json
index 5bca344..71425d6 100644
--- a/panel/src/i18n/resources/zh-CN/errors.json
+++ b/panel/src/i18n/resources/zh-CN/errors.json
@@ -67,6 +67,7 @@
   "already_terminal": "该构建已经结束，无法重复取消。",
   "build_unavailable": "构建功能当前不可用。",
   "build_logs_unavailable": "构建日志暂时不可用。",
+  "scan_document_not_kept": "这次构建没有留下这份扫描文件：文件太大没有保存，或者生成它的步骤失败了。",
   "already_reviewed": "该提交已经审核过了。",
   "context_changed": "提交者在你审阅之后重新上传了构建上下文。请重新下载并审阅新的上传再通过。",
   "submission_quota_exceeded": "你的提交配额已满：待审核提交过多，或待审核和被拒绝的上传占满了存储额度。可以撤回一个待审核的提交；被拒绝的上传在审核 7 天后释放空间，已批准的不占额度。",
diff --git a/panel/src/lib/api.test.ts b/panel/src/lib/api.test.ts
index f3b8745..f60cf2f 100644
--- a/panel/src/lib/api.test.ts
+++ b/panel/src/lib/api.test.ts
@@ -1066,6 +1066,24 @@ describe("responses that are not the API's JSON", () => {
     await expect(api.me()).rejects.toMatchObject({ status: 200, code: "upstream_unavailable" });
   });
 
+  it("names a scan file the build did not keep in the UI language, never in the backend's English", async () => {
+    const { default: i18next } = await import("i18next");
+    const err = {
+      status: 404,
+      code: "scan_document_not_kept",
+      message: "this build's scan kept no sbom: it was too large to keep, or the step that writes it failed",
+    };
+    expect(humanizeError(err)).toBe(
+      "This build kept no copy of that scan file: it was too large to keep, or the step that writes it failed.",
+    );
+    await i18next.changeLanguage("zh-CN");
+    try {
+      expect(humanizeError(err)).toBe("这次构建没有留下这份扫描文件：文件太大没有保存，或者生成它的步骤失败了。");
+    } finally {
+      await i18next.changeLanguage("en-US");
+    }
+  });
+
   it("maps an unknown 5xx code to the unavailable line", () => {
     expect(humanizeError({ status: 500, code: "internal", message: "internal error" })).toMatch(/unavailable/i);
     expect(humanizeError({ status: 413, code: "error", message: "Payload Too Large" })).toMatch(/larger/i);
diff --git a/panel/src/lib/api.ts b/panel/src/lib/api.ts
index 5dec024..c190917 100644
--- a/panel/src/lib/api.ts
+++ b/panel/src/lib/api.ts
@@ -1169,6 +1169,8 @@ export function humanizeError(e: unknown): string {
       return t("build_unavailable");
     case "build_logs_unavailable":
       return t("build_logs_unavailable");
+    case "scan_document_not_kept":
+      return t("scan_document_not_kept");
     case "already_reviewed":
       return t("already_reviewed");
     case "context_changed":
diff --git a/panel/src/pages/admin/BuildScanPanel.test.tsx b/panel/src/pages/admin/BuildScanPanel.test.tsx
index b1f219a..b52b2b9 100644
--- a/panel/src/pages/admin/BuildScanPanel.test.tsx
+++ b/panel/src/pages/admin/BuildScanPanel.test.tsx
@@ -124,7 +124,7 @@ describe("BuildScanPanel", () => {
     });
     await userEvent.click(within(panel).getByRole("button", { name: "Trivy report" }));
     expect((await within(panel).findByRole("alert")).textContent).toBe(
-      "Couldn't download: this build's scan kept no report: it was too large to keep, or the step that writes it failed",
+      "Couldn't download: This build kept no copy of that scan file: it was too large to keep, or the step that writes it failed.",
     );
   });