Hi @jerico bernales - I am able to send 69MB pdf file to Teams channel using following query.
Content-type: application/json
{
"body": {
"contentType": "html",
"content": "Here's the latest budget. <attachment id=\"153fa47d-18c9-4179-be08-9879815a9f90\"></attachment>"
},
"attachments": [
{
"id": "153fa47d-18c9-4179-be08-9879815a9f90",
"contentType": "reference",
"contentUrl": "https://m365x987948.sharepoint.com/sites/test/Shared%20Documents/General/test%20doc.docx",
"name": "Budget.docx"
}
]
}`
Could you please share the request and error message which you are getting.