diff --git a/cloud_storage_handler/api/elixircloud/csh/controllers.py b/cloud_storage_handler/api/elixircloud/csh/controllers.py
index fb23a34..8bc2d58 100644
--- a/cloud_storage_handler/api/elixircloud/csh/controllers.py
+++ b/cloud_storage_handler/api/elixircloud/csh/controllers.py
@@ -1,15 +1,84 @@
 """ELIXIR's Cloud Storage Handler controllers."""
 
 import logging
+import os
+import uuid
 from http import HTTPStatus
 
-from flask import jsonify
+from flask import current_app, jsonify, request
+from minio.error import S3Error
 
 logger = logging.getLogger(__name__)
 
+UPLOAD_DIRECTORY = "/tmp/upload"
+CHUNK_SIZE = 5 * 1024 * 1024
+
 
 def home():
     """Endpoint to return a welcome message."""
     return jsonify(
         {"message": "Welcome to the Cloud Storage Handler server!"}
     ), HTTPStatus.OK
+
+
+def upload_object():
+    """Handles file uploads to cloud storage.
+
+    Retrieves files from the request, processes each file into chunks,
+    and uploads them to the specified storage bucket. Returns a response
+    with a success message and details about the uploaded file(s).
+    """
+    files = request.files.getlist("files")
+    responses = []
+    minio_config = current_app.config.foca.custom.minio
+    bucket_name = minio_config.bucket_name
+    minio_client = current_app.config.foca.custom.minio.client.client
+
+    for file in files:
+        if not file:
+            return jsonify({"error": "No file provided"}), 400
+
+        file_id = str(uuid.uuid4())
+        file_path = os.path.join(UPLOAD_DIRECTORY, f"{file_id}.temp")
+
+        file.save(file_path)
+
+        total_size = os.path.getsize(file_path)
+        total_chunks = (total_size // CHUNK_SIZE) + (
+            1 if total_size % CHUNK_SIZE > 0 else 0
+        )
+
+        file_dir = os.path.join(UPLOAD_DIRECTORY, file_id)
+        os.makedirs(file_dir, exist_ok=True)
+
+        with open(file_path, "rb") as f:
+            for i in range(total_chunks):
+                chunk_data = f.read(CHUNK_SIZE)
+                chunk_filename = os.path.join(file_dir, f"chunk_{i}")
+                with open(chunk_filename, "wb") as chunk_file:
+                    chunk_file.write(chunk_data)
+
+                try:
+                    minio_client.fput_object(
+                        bucket_name,
+                        f"{file_id}/chunk_{i}",
+                        chunk_filename,
+                        metadata={
+                            "description": "Chunk upload via Flask",
+                        },
+                    )
+                except S3Error as e:
+                    return jsonify({"error": str(e)}), 500
+
+        os.remove(file_path)
+        os.rmdir(file_dir)
+
+        responses.append(
+            {
+                "message": "File uploaded successfully",
+                "file_id": file_id,
+                "total_chunks": total_chunks,
+            }
+        )
+
+    return jsonify(responses), 200
diff --git a/cloud_storage_handler/api/specs/specs.yaml b/cloud_storage_handler/api/specs/specs.yaml
index 2c61d7f..6698206 100644
--- a/cloud_storage_handler/api/specs/specs.yaml
+++ b/cloud_storage_handler/api/specs/specs.yaml
@@ -35,4 +35,36 @@ paths:
           description: The request is malformed.
         '500':
           description: An unexpected error occurred.
-...
+  /object:
+    post:
+      description: |
+        Create a new object upload using the TUS protocol. The request creates an empty object and returns an upload URL.
+      operationId: upload_object
+      requestBody:
+        required: true
+        content:
+          multipart/form-data:
+            schema:
+              type: object
+              properties:
+                file:
+                  type: string
+                  format: binary
+                  description: The file to be uploaded (supports .bib, .txt, .docx, and other file types).
+      responses:
+        '201':
+          description: Object upload created successfully.
+          headers:
+            Location:
+              schema:
+                type: string
+              description: URL to upload object chunks using PATCH requests.
+            Tus-Resumable:
+              schema:
+                type: string
+              description: Version of the TUS protocol used.
+        '400':
+          description: Bad request or malformed request body.
+        '500':
+          description: An unexpected error occurred.
+...
\ No newline at end of file