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Thank you very much Phong! This was very helpful!

We were able to upload the attachment, the only weird behavior that we saw is that just by uploading a file, it showed up in the team as a post. We didn't have to create a post after uploading the file and then reference the attachment id. This is fine when the attachment doesn't have a text (the user didn't write a message when sending the attachment) but when there is a message/text and we create that post with the text/message and reference the attachmentID, then the file shows up on 2 posts (one without the message and one with the message). Is there somehow we can hide the post created when uploading a file?

Here is some snippet code

// Read your chat or team to get a chat or team id
async function get_glip_chat(){
  try{
    var endpoint = "/restapi/v1.0/glip/chats"
    var resp = await platform.get(endpoint)
    var json = await resp.json()
    for (var record of json.records){
      console.log("Chat name: " + record.name)
      console.log("Chat id: " + record.id)
      if (record.name == "A Chat Name"){
        uploadFile(record.id)
        break
      }
    }
  }catch(e){
    console.log(e)
  }
}
// upload your file
async function uploadFile(groupId){
  var endpoint = `/restapi/v1.0/glip/files?name=test.jpg&groupId=${groupId}`

  var FormData = require('form-data');
  formData = new FormData();

  formData.append('attachment', require('fs').createReadStream('test.jpg'));
  try {
    var resp = await platform.post(endpoint, formData)
    var jsonObj = await resp.json()
    postAttachment(groupId, jsonObj[0].id)
  }catch(e){
    console.log(e)
  }
}
// post text and attachment
function postAttachment(groupId, attachmentId){
  var endpoint = `/restapi/v1.0/glip/chats/${groupId}/posts`
  var params = {
    "text": "Hello there. My first image file",
    "attachments": [ {
      "id": attachmentId,
      "type": "File"
    } ]
  }
  platform.post(endpoint, params)
    .then(function(resp){
        var json = resp.json()
    })
    .catch(function(e){
        console.log(e)
    })
}

The known issue is that you will see 2 posts, one with just an attachment and the second one with text and attachment.