diff --git a/backend/app/services/importer.py b/backend/app/services/importer.py
index 88d1a76..c51a9fc 100644
--- a/backend/app/services/importer.py
+++ b/backend/app/services/importer.py
@@ -79,6 +79,12 @@ IMAGE_EXTS = {".png", ".jpg", ".jpeg", ".gif", ".webp", ".bmp", ".tif", ".tiff"}
 VIDEO_EXTS = {".mp4", ".mov", ".avi", ".mkv", ".webm", ".m4v", ".wmv", ".flv"}
 ALL_EXTS = IMAGE_EXTS | VIDEO_EXTS
 
+# A "high-resolution files" pack often wraps per-chapter .rar/.zip inside one
+# outer archive (incase #718) — recurse into nested archives so their images
+# land instead of being silently dropped. Cap the depth so a maliciously
+# deep-nested archive can't recurse forever; the bomb-probe re-runs per level.
+_ARCHIVE_MAX_DEPTH = 3
+
 
 def is_supported(path: Path) -> bool:
     return path.suffix.lower() in ALL_EXTS
@@ -491,17 +497,17 @@ class Importer:
         artist_use = artist if artist is not None else self._resolve_artist(source)
         post = self._post_for_sidecar(source, artist_use)
         member_ids: list[int] = []
-        member_total = 0
-        with extract_archive(source) as members:
-            for _name, member_path in members:
-                member_total += 1
-                if not is_supported(member_path):
-                    continue  # non-media preserved via the stored archive
-                res = self._import_media(
-                    member_path, source, explicit_source=source_row,
-                )
-                if res.status in ("imported", "superseded") and res.image_id:
-                    member_ids.append(res.image_id)
+        # Per-outcome tally so the "no images" reason names the ACTUAL cause
+        # (#718): nested-archive packs, all-deduped (benign), unsupported formats,
+        # or failed/corrupt members — instead of one catch-all string.
+        counts = {
+            "media": 0, "deduped": 0, "unsupported": 0,
+            "failed": 0, "nested": 0, "nested_rejected": 0,
+        }
+        self._collect_archive_members(
+            source, attribution=source, source_row=source_row,
+            depth=0, member_ids=member_ids, counts=counts,
+        )
         # Preserve the archive itself (links to the same Post/Artist).
         self._capture_attachment(
             source, post=post, artist=artist_use, resolved=True
@@ -511,20 +517,93 @@ class Importer:
                 status="imported", image_id=member_ids[0],
                 member_image_ids=member_ids,
             )
-        # No images landed — surface WHY so a post showing "no images" beside an
-        # archive is diagnosable instead of silent. Zero members usually means
-        # the extractor backend is missing/failed (unar for rar, py7zr for 7z)
-        # or the file is corrupt; non-zero-but-no-images means it held only
-        # non-media files.
-        reason = (
-            "archive extracted but held no supported image/video members"
-            if member_total
-            else "archive yielded no members (unsupported/corrupt, or the "
-            "extractor backend failed)"
-        )
+        # No NEW images landed. Name WHY precisely so a post showing "no images"
+        # beside an archive is diagnosable — and DON'T flag the benign all-deduped
+        # case as a problem: those images already exist in the library and were
+        # re-linked to this post (enrich-on-duplicate), so the post DOES show them.
+        if counts["media"] == 0 and counts["nested"] == 0:
+            reason = ("archive yielded no members (unsupported/corrupt, or the "
+                      "extractor backend failed)")
+        elif counts["deduped"] and not (
+            counts["unsupported"] or counts["failed"] or counts["nested_rejected"]
+        ):
+            log.info(
+                "%s: all %d image member(s) already in library (deduped + linked "
+                "to this post) — archive preserved, no new import",
+                source.name, counts["deduped"],
+            )
+            return ImportResult(status="attached")
+        else:
+            reason = (
+                f"no new images — media={counts['media']} deduped={counts['deduped']} "
+                f"unsupported/non-media={counts['unsupported']} failed={counts['failed']} "
+                f"nested={counts['nested']} nested-rejected={counts['nested_rejected']}"
+            )
         log.warning("%s: %s", source.name, reason)
         return ImportResult(status="attached", error=reason)
 
+    def _collect_archive_members(
+        self, archive_path: Path, *, attribution: Path,
+        source_row: Source | None, depth: int,
+        member_ids: list[int], counts: dict,
+    ) -> None:
+        """Extract `archive_path` and import its image/video members, RECURSING
+        into nested archives (#718). Members attribute to `attribution` — the
+        OUTER archive's path, so its sidecar resolves them to the right Post even
+        when they came from a nested archive. Depth-capped + bomb-probed per
+        nested level. Mutates `member_ids` and `counts` in place.
+
+        extract_archive is fail-soft, but each level is wrapped so one bad nested
+        archive can't abort the whole import."""
+        try:
+            with extract_archive(archive_path) as members:
+                for _name, member_path in members:
+                    if not member_path.is_file():
+                        continue  # directory entries etc. — not media
+                    if is_archive(member_path):
+                        counts["nested"] += 1
+                        if depth + 1 > _ARCHIVE_MAX_DEPTH:
+                            counts["nested_rejected"] += 1
+                            log.warning(
+                                "nested archive past depth cap %d, skipped: %s",
+                                _ARCHIVE_MAX_DEPTH, member_path.name,
+                            )
+                            continue
+                        probe = safe_probe.probe_archive(member_path)
+                        if not probe.ok:
+                            counts["nested_rejected"] += 1
+                            log.warning(
+                                "nested archive rejected (%s): %s",
+                                probe.reason, member_path.name,
+                            )
+                            continue
+                        self._collect_archive_members(
+                            member_path, attribution=attribution,
+                            source_row=source_row, depth=depth + 1,
+                            member_ids=member_ids, counts=counts,
+                        )
+                        continue
+                    counts["media"] += 1
+                    if not is_supported(member_path):
+                        counts["unsupported"] += 1
+                        continue  # non-media preserved via the stored archive
+                    res = self._import_media(
+                        member_path, attribution, explicit_source=source_row,
+                    )
+                    if res.status in ("imported", "superseded") and res.image_id:
+                        member_ids.append(res.image_id)
+                    elif res.status == "skipped" and res.skip_reason in (
+                        SkipReason.duplicate_hash, SkipReason.duplicate_phash
+                    ):
+                        counts["deduped"] += 1
+                    else:
+                        counts["failed"] += 1
+        except Exception as exc:  # noqa: BLE001 — defensive per level; keep going
+            log.warning(
+                "archive extraction failed for %s (depth %d): %s",
+                archive_path.name, depth, exc,
+            )
+
     def _import_media(
         self, source: Path, attribution_path: Path,
         *, explicit_source: Source | None = None,
diff --git a/tests/test_importer_archive.py b/tests/test_importer_archive.py
index 713678b..113d00f 100644
--- a/tests/test_importer_archive.py
+++ b/tests/test_importer_archive.py
@@ -93,6 +93,77 @@ def test_archive_imports_members_and_stores_archive(importer, import_layout):
     assert att.post_id == post.id
 
 
+def test_nested_archive_members_imported(importer, import_layout):
+    """#718: a 'high-res' pack that wraps a nested archive must still import the
+    nested images and link them to the post — not silently drop them (incase's
+    per-chapter .rar inside an outer 'High Resolution files' pack)."""
+    import_root, _ = import_layout
+    importer.settings.phash_threshold = 0  # v/h splits are distinct only at 0
+    inner = io.BytesIO()
+    with zipfile.ZipFile(inner, "w") as zf:
+        zf.writestr("p1.jpg", _split_bytes("v"))
+        zf.writestr("p2.jpg", _split_bytes("h"))
+    arc = import_root / "Nessie" / "hr.cbz"
+    arc.parent.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(arc, "w") as zf:
+        zf.writestr("chapter.zip", inner.getvalue())  # nested archive, no direct media
+    arc.with_suffix(".cbz.json").write_text(json.dumps(
+        {"category": "patreon", "id": "900", "title": "HR Pack"}))
+
+    r = importer.import_one(arc)
+    assert r.status == "imported"
+    assert len(r.member_image_ids) == 2  # both nested images surfaced
+
+    assert importer.session.execute(
+        select(func.count()).select_from(ImageRecord)
+    ).scalar_one() == 2
+    post = importer.session.execute(select(Post)).scalar_one()
+    provs = importer.session.execute(
+        select(func.count()).select_from(ImageProvenance)
+    ).scalar_one()
+    assert provs == 2  # both nested members linked to the one outer post
+    # The outer pack is still preserved as an attachment.
+    att = importer.session.execute(select(PostAttachment)).scalar_one()
+    assert att.original_filename == "hr.cbz"
+    assert att.post_id == post.id
+
+
+def test_archive_all_deduped_is_benign_not_flagged(importer, import_layout):
+    """#718 reason-string fix: when every image in an archive already exists
+    (cross-posted), the images re-link to the new post and the archive is NOT
+    flagged as an unextracted-archive problem (no error set)."""
+    import_root, _ = import_layout
+    importer.settings.phash_threshold = 0
+    pv, ph = _split_bytes("v"), _split_bytes("h")
+    first = import_root / "Dup" / "a.cbz"
+    first.parent.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(first, "w") as zf:
+        zf.writestr("a.jpg", pv)
+        zf.writestr("b.jpg", ph)
+    first.with_suffix(".cbz.json").write_text(json.dumps(
+        {"category": "patreon", "id": "111", "title": "First"}))
+    assert importer.import_one(first).status == "imported"
+
+    second = import_root / "Dup" / "b.cbz"  # different post, same two images
+    with zipfile.ZipFile(second, "w") as zf:
+        zf.writestr("a.jpg", pv)
+        zf.writestr("b.jpg", ph)
+    second.with_suffix(".cbz.json").write_text(json.dumps(
+        {"category": "patreon", "id": "222", "title": "Second"}))
+
+    r = importer.import_one(second)
+    assert r.status == "attached"
+    assert r.error is None  # benign all-deduped — NOT a flagged problem
+
+    assert importer.session.execute(
+        select(func.count()).select_from(ImageRecord)
+    ).scalar_one() == 2  # no new records
+    provs = importer.session.execute(
+        select(func.count()).select_from(ImageProvenance)
+    ).scalar_one()
+    assert provs == 4  # 2 images × 2 posts (enrich-on-duplicate)
+
+
 def test_corrupt_archive_still_stored(importer, import_layout):
     import_root, _ = import_layout
     arc = import_root / "Bob" / "broken.zip"