diff --git a/plane/api/work_items/attachments.py b/plane/api/work_items/attachments.py
index 53bf7a8..046adda 100644
--- a/plane/api/work_items/attachments.py
+++ b/plane/api/work_items/attachments.py
@@ -1,6 +1,10 @@
+from __future__ import annotations
+
 from collections.abc import Mapping
 from typing import Any
 
+import requests as _requests
+
 from ...models.work_items import (
     UpdateWorkItemAttachment,
     WorkItemAttachment,
@@ -96,6 +100,92 @@ def update(
         )
         return WorkItemAttachment.model_validate(response)
 
+    def upload_from_bytes(
+        self,
+        workspace_slug: str,
+        project_id: str,
+        work_item_id: str,
+        file_bytes: bytes,
+        name: str,
+        content_type: str,
+    ) -> WorkItemAttachment:
+        """Upload a file to a work item as an attachment.
+
+        Handles the full three-step flow:
+          1. Create the attachment record and receive a presigned S3 upload URL.
+          2. Upload the file bytes directly to S3 via the presigned POST.
+          3. Mark the attachment as uploaded (PATCH is_uploaded=True).
+
+        Args:
+            workspace_slug: The workspace slug identifier
+            project_id: UUID of the project
+            work_item_id: UUID of the work item
+            file_bytes: Raw file bytes to upload
+            name: Filename (e.g. "report.pdf")
+            content_type: MIME type (e.g. "application/pdf")
+        """
+        size = len(file_bytes)
+
+        # Step 1 — create attachment record, get presigned S3 POST URL
+        raw = self._post(
+            f"{workspace_slug}/projects/{project_id}/work-items/{work_item_id}/attachments",
+            {"name": name, "type": content_type, "size": size},
+        )
+        upload_data = raw["upload_data"]
+        asset_id = raw["asset_id"]
+        attachment = WorkItemAttachment.model_validate(raw["attachment"])
+
+        # Step 2 — upload bytes to S3 (raw requests, no Plane auth headers)
+        fields = upload_data.get("fields", {})
+        s3_resp = _requests.post(
+            upload_data["url"],
+            data=fields,
+            files={"file": (name, file_bytes, content_type)},
+            timeout=120,
+        )
+        s3_resp.raise_for_status()
+
+        # Step 3 — mark as uploaded (returns 204, no body)
+        self._patch(
+            f"{workspace_slug}/projects/{project_id}/work-items/{work_item_id}/attachments/{asset_id}",
+            {"is_uploaded": True},
+        )
+
+        return attachment
+
+    def get_download_url(
+        self,
+        workspace_slug: str,
+        project_id: str,
+        work_item_id: str,
+        attachment_id: str,
+    ) -> str:
+        """Get a presigned download URL for a work item attachment.
+
+        Calls the attachment detail endpoint which issues a redirect to a
+        time-limited presigned S3 URL. The returned URL can be opened in a
+        browser or fetched with any HTTP client — no Plane auth required.
+
+        Args:
+            workspace_slug: The workspace slug identifier
+            project_id: UUID of the project
+            work_item_id: UUID of the work item
+            attachment_id: UUID of the attachment
+
+        Returns:
+            Presigned S3 URL (time-limited, typically ~1 hour)
+        """
+        url = self._build_url(
+            f"{workspace_slug}/projects/{project_id}/work-items/{work_item_id}/attachments/{attachment_id}"
+        )
+        resp = self.session.get(url, headers=self._headers(), allow_redirects=False, timeout=self.config.timeout)
+        if resp.status_code in (301, 302, 303, 307, 308):
+            location = resp.headers.get("Location")
+            if location:
+                return location
+        # Not a redirect — let _handle_response raise or return
+        return self._handle_response(resp)
+
     def delete(
         self, workspace_slug: str, project_id: str, work_item_id: str, attachment_id: str
     ) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index 10eec4e..18218a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "plane-sdk"
-version = "0.2.15"
+version = "0.2.16"
 description = "Python SDK for Plane API"
 readme = "README.md"
 requires-python = ">=3.10"