test gửi bài học

"{\"id\":7622,\"type\":\"image\",\"url\":\"https:\/\/biteducation.easyedu.vn\/sites\/default\/files\/easyschool\/upload\/2026\/03\/nghe_28.3.jpg\",\"width\":1366,\"height\":768,\"thumbnail\":\"https:\/\/biteducation.easyedu.vn\/sites\/default\/files\/styles\/large\/public\/easyschool\/upload\/2026\/03\/nghe_28.3.jpg?itok=JBoIN6BK\"}"

"{\"id\":7623,\"type\":\"document\",\"url\":\"https:\/\/biteducation.easyedu.vn\/sites\/default\/files\/easyschool\/upload\/2026\/03\/de_doc_chuyen_26-3_0.pdf\",\"width\":null,\"height\":null,\"thumbnail\":\"https:\/\/biteducation.easyedu.vn\/sites\/all\/themes\/easyedu\/images\/pdf-large.png\"}"