add: uploadAttachment api

application/controllers/mockup/purchase/order/PurchaseOrder.http

@@ -172,6 +172,45 @@ Content-Type: application/json
     "ID": ""
 }
 
+###
+// upload attachment — requires multipart/form-data with file(s)
+// Gunakan REST Client atau Postman. Contoh format:
+// POST https://{{host}}/mockup/purchase/order/PurchaseOrderAset/uploadAttachment/
+// Content-Type: multipart/form-data; boundary=----boundary
+// 
+// ------boundary
+// Content-Disposition: form-data; name="token"
+// 
+// eyJ...
+// ------boundary
+// Content-Disposition: form-data; name="ponumber"
+// 
+// PO24070001
+// ------boundary
+// Content-Disposition: form-data; name="poID"
+// 
+// 1
+// ------boundary
+// Content-Disposition: form-data; name="contractID"
+// 
+// 1
+// ------boundary
+// Content-Disposition: form-data; name="files"; filename="foto1.jpg"
+// Content-Type: image/jpeg
+// 
+// < /path/to/foto1.jpg
+// ------boundary
+// Content-Disposition: form-data; name="files"; filename="foto2.jpg"
+// Content-Type: image/jpeg
+// 
+// < /path/to/foto2.jpg
+// ------boundary--
+Content-Type: application/json
+
+{
+    "token": {{token}}
+}
+
 ###
 // listing po asset
 POST https://{{host}}/mockup/purchase/order/PurchaseOrderAset/getDaftarPoAset/