diff --git a/apps/internal-site/components/web-uploader/source-scanner.test.ts b/apps/internal-site/components/web-uploader/source-scanner.test.ts
index 7ed1082..4f7dbcf 100644
--- a/apps/internal-site/components/web-uploader/source-scanner.test.ts
+++ b/apps/internal-site/components/web-uploader/source-scanner.test.ts
@@ -165,6 +165,60 @@ describe("scanBrowserUploadFiles", () => {
     expect(plan.frames.map((frame) => frame.title)).toEqual(["00-2183", "12-27240"]);
   });
 
+  it("sorts structured flat volumes numerically when episode and frame match", () => {
+    const plan = scanBrowserUploadFiles(
+      [
+        image("TITLE_VOL10_00000.m2ts-27240-src.png"),
+        image("TITLE_VOL10_00000.m2ts-27240-output.png"),
+        image("TITLE_VOL2_00000.m2ts-27240-src.png"),
+        image("TITLE_VOL2_00000.m2ts-27240-output.png"),
+      ],
+      "20260702",
+    );
+
+    expect(plan.frames).toHaveLength(2);
+    expect(plan.frames.map((frame) => frame.before.source.relativePath)).toEqual([
+      "TITLE_VOL2_00000.m2ts-27240-src.png",
+      "TITLE_VOL10_00000.m2ts-27240-src.png",
+    ]);
+  });
+
+  it("keeps unrelated flat titles grouped before comparing volume numbers", () => {
+    const plan = scanBrowserUploadFiles(
+      [
+        image("BBB_VOL2_00000.m2ts-27240-src.png"),
+        image("BBB_VOL2_00000.m2ts-27240-output.png"),
+        image("AAA_VOL10_00000.m2ts-27240-src.png"),
+        image("AAA_VOL10_00000.m2ts-27240-output.png"),
+      ],
+      "20260702",
+    );
+
+    expect(plan.frames).toHaveLength(2);
+    expect(plan.frames.map((frame) => frame.before.source.relativePath)).toEqual([
+      "AAA_VOL10_00000.m2ts-27240-src.png",
+      "BBB_VOL2_00000.m2ts-27240-src.png",
+    ]);
+  });
+
+  it("sorts structured nested volumes numerically when episode and frame match", () => {
+    const plan = scanBrowserUploadFiles(
+      [
+        image("case/before/TITLE_VOL10_00000.m2ts-27240.png"),
+        image("case/after/TITLE_VOL10_00000.m2ts-27240.png"),
+        image("case/before/TITLE_VOL2_00000.m2ts-27240.png"),
+        image("case/after/TITLE_VOL2_00000.m2ts-27240.png"),
+      ],
+      "case",
+    );
+
+    expect(plan.frames).toHaveLength(2);
+    expect(plan.frames.map((frame) => frame.before.source.relativePath)).toEqual([
+      "before/TITLE_VOL2_00000.m2ts-27240.png",
+      "before/TITLE_VOL10_00000.m2ts-27240.png",
+    ]);
+  });
+
   it("recognizes structured encode filenames with m2ts markers and no fps prefix", () => {
     const plan = scanBrowserUploadFiles(
       [
diff --git a/apps/internal-site/components/web-uploader/source-scanner.ts b/apps/internal-site/components/web-uploader/source-scanner.ts
index 3725219..fe22087 100644
--- a/apps/internal-site/components/web-uploader/source-scanner.ts
+++ b/apps/internal-site/components/web-uploader/source-scanner.ts
@@ -63,8 +63,15 @@ const MATCH_KEY_SUFFIX_RE = new RegExp(
   "i",
 );
 const NON_ALNUM_RE = /[^0-9a-z]+/g;
+const VOLUME_HINT_RE = /(?:^|[^a-zA-Z0-9])(VOL|BOX)[ _-]*(\d+)(?=$|[^a-zA-Z0-9])/i;
 const MAX_AFTER_ASSETS = 4;
 
+interface VolumeSortKey {
+  kind: "VOL" | "BOX";
+  number: number;
+  label: string;
+}
+
 interface SourceCandidate {
   entry: BrowserUploadFile;
   originalName: string;
@@ -125,6 +132,45 @@ function titleCase(input: string) {
     .replace(/\b\w/g, (letter) => letter.toUpperCase());
 }
 
+function volumeSortKey(input: string): VolumeSortKey | null {
+  const match = input.match(VOLUME_HINT_RE);
+  if (!match) {
+    return null;
+  }
+
+  const kind = match[1].toUpperCase() as VolumeSortKey["kind"];
+  const number = Number(match[2]);
+  return { kind, number, label: `${kind}${number}` };
+}
+
+function compareVolumeHints(left: string, right: string) {
+  const leftKey = volumeSortKey(left);
+  const rightKey = volumeSortKey(right);
+  const kindRank = (key: VolumeSortKey | null) => key ? (key.kind === "VOL" ? 0 : 1) : 2;
+
+  return (
+    kindRank(leftKey) - kindRank(rightKey) ||
+    (leftKey?.number ?? Number.MAX_SAFE_INTEGER) - (rightKey?.number ?? Number.MAX_SAFE_INTEGER)
+  );
+}
+
+function rootHintWithoutVolume(input: string) {
+  return input
+    .replace(VOLUME_HINT_RE, " ")
+    .toLowerCase()
+    .replace(NON_ALNUM_RE, " ")
+    .trim();
+}
+
+function compareRootHints(left: string, right: string) {
+  // Keep unrelated titles grouped first; volume numbers only break ties within the same root title.
+  return (
+    rootHintWithoutVolume(left).localeCompare(rootHintWithoutVolume(right)) ||
+    compareVolumeHints(left, right) ||
+    left.localeCompare(right)
+  );
+}
+
 function variantLabel(variant: string) {
   const normalized = variant.toLowerCase();
   if (PRIMARY_AFTER_VARIANTS.has(normalized)) {
@@ -576,7 +622,7 @@ function buildFlatPlan(sourceRootName: string, entries: BrowserUploadFile[], ign
     return (
       Number(leftCandidate.episode) - Number(rightCandidate.episode) ||
       leftCandidate.frameNumber - rightCandidate.frameNumber ||
-      leftCandidate.rootHint.localeCompare(rightCandidate.rootHint)
+      compareRootHints(leftCandidate.rootHint, rightCandidate.rootHint)
     );
   });
   const fallbackWidth = Math.max(
@@ -643,7 +689,13 @@ function buildNestedPlan(sourceRootName: string, entries: BrowserUploadFile[], i
   const miscAssignments = assignCandidatesToBeforeKeys(miscParsed, beforeByKey);
   const allBefore = [...beforeByKey.entries()]
     .map(([matchKey, candidates]) => [matchKey, candidates[0]] as const)
-    .sort((left, right) => Number(left[1].episode) - Number(right[1].episode) || left[1].frameNumber - right[1].frameNumber || left[0].localeCompare(right[0]));
+    .sort(
+      (left, right) =>
+        Number(left[1].episode) - Number(right[1].episode) ||
+        left[1].frameNumber - right[1].frameNumber ||
+        compareRootHints(left[1].rootHint, right[1].rootHint) ||
+        left[0].localeCompare(right[0]),
+    );
   const fallbackWidth = Math.max(4, String(Math.max(0, ...allBefore.map(([, candidate]) => candidate.frameNumber))).length);
   const episodeWidth = structuredEpisodeWidth(beforeParsed.candidates);
   const frames: WebUploadFramePlan[] = [];