diff --git a/report_carbone/models/base/ir_actions_report.py b/report_carbone/models/base/ir_actions_report.py
index 4834e41..361b354 100644
--- a/report_carbone/models/base/ir_actions_report.py
+++ b/report_carbone/models/base/ir_actions_report.py
@@ -129,6 +129,8 @@ class IrActionsReportCarbone(models.Model):
         "supported by Carbone. You must provide a production API key and must not "
         "be in test mode.",
     )
+    template_file = fields.Binary(string="Template file", attachment=True)
+    template_filename = fields.Char(string="Template filename")
 
     @api.model
     def _setup_template_id_and_extension(self, vals):
@@ -849,6 +851,42 @@ class IrActionsReportCarbone(models.Model):
         response = self.call_carbone_endpoint("template", method="POST", files=files, data=data)
         return {"template_id": response["data"]["id"], "file_extension": file_extension}
 
+    def action_upload_template_to_carbone(self):
+        self.ensure_one()
+        if not self.template_file:
+            raise exceptions.UserError(_("Please select a template file to upload."))
+        filename = self.template_filename or "template.docx"
+        file_content = base64.b64decode(self.template_file)
+        file_extension = os.path.splitext(filename)[1].lstrip(".")
+        import tempfile
+        with tempfile.NamedTemporaryFile(suffix=f".{file_extension}", delete=False) as tmp:
+            tmp.write(file_content)
+            tmp_path = tmp.name
+        try:
+            csdk = self.get_carbone_sdk()
+            response = csdk.add_template(tmp_path)
+        finally:
+            os.unlink(tmp_path)
+        if not response.get("success") or not response.get("data", {}).get("templateId"):
+            raise exceptions.UserError(_("Carbone did not return a valid template ID. Response: %s") % response)
+        template_id = response["data"]["templateId"]
+        self.write({
+            "template_id": template_id,
+            "file_extension": file_extension or "docx",
+            "template_file": False,
+            "template_filename": False,
+        })
+        return {
+            "type": "ir.actions.client",
+            "tag": "display_notification",
+            "params": {
+                "title": _("Template uploaded"),
+                "message": _("Template ID: %s") % template_id,
+                "type": "success",
+                "sticky": False,
+            },
+        }
+
     def get_extension_file_from_api(self, template_id: str, raise_error=True) -> str | bool:
         # If we are in install mode, for unit test for example, and we have to init a ir.actions.report from an XML
         # file, we don't wan't to call Carbone's API to retrieve extension.
@@ -886,7 +924,7 @@ class IrActionsReportCarbone(models.Model):
         # We have to specified carbone-version 5
         headers = {"Authorization": "Bearer " + api_token, "carbone-version": "5"}
 
-        url = f"{api_endpoint}/{endpoint}"
+        url = f"{api_endpoint.rstrip('/')}/{endpoint}"
         if params:
             url = urljoin(url, "?" + urls.url_encode(params))
         if method == "GET":
diff --git a/report_carbone/views/base/ir_actions_report.xml b/report_carbone/views/base/ir_actions_report.xml
index 0496855..ae9dbfb 100644
--- a/report_carbone/views/base/ir_actions_report.xml
+++ b/report_carbone/views/base/ir_actions_report.xml
@@ -49,6 +49,17 @@
                 />
                 <field name="is_valid_template_id" invisible="True"/>
                 <field name="file_extension" invisible="True"/>
+                <group invisible="report_type != 'carbone'" string="Upload template">
+                    <field name="template_file" filename="template_filename" widget="binary"/>
+                    <field name="template_filename" invisible="True"/>
+                    <button
+                        name="action_upload_template_to_carbone"
+                        type="object"
+                        string="Upload to Carbone"
+                        class="btn-primary"
+                        invisible="not template_file"
+                    />
+                </group>
                 <field name="lang_ids" widget="many2many_tags" invisible="report_type != 'carbone'"/>
                 <field
                     name="currency_id"