Upload attachments using API via Power Automate (resource subtype = "external")

[Daniel_Perez]

Hey there,
I’m using MS Forms to create and update Asana tasks, with the integration configured via Power Automate. However, I’m encountering an issue when trying to upload an attachment from MS Forms to an Asana task using the upload attachment the endpoint: https://app.asana.com/api/1.0/attachments

The attachments either upload as a link when using ‘external’ as the subtype or as an actual file that is unreadable/unsupported when using ‘asana’ as the subtype.

Has anyone successfully uploaded an actual file using the external method? Here’s the code in my HTTP request for reference:

{
  "$content-type": "multipart/form-data",
  "$multipart": [
    {
      "headers": {
        "Content-Disposition": "form-data; name=\"parent\""
      },
      "body": "@{variables('myVariable')}"
    },
    {
      "headers": {
        "Content-Disposition": "form-data; name=\"resource_subtype\""
      },
      "body": "external"
    },
    {
      "headers": {
        "Content-Disposition": "form-data; name=\"url\""
      },
      "body": "@{items('Attachment-Get_file_content_and_add_to_task')['link']}"
    },
    {
      "headers": {
        "Content-Disposition": "form-data; name=\"name\""
      },
      "body": "@{outputs('Attachment-Get_file_metadata')?['body/Name']}"
    },
    {
      "headers": {
        "Content-Disposition": "form-data; name=\"file\"; filename=\"@{outputs('Attachment-Get_file_metadata')?['body/Name']}\"",
        "Content-Type": "@{body('Attachment-Get_file_content_and_add_to_task')?['$content-type']}"
      },
      "body": "@{body('Attachment-Get_file_content_and_add_to_task')?['$content']}"
    }
  ]
}

Thanks in advance,
Daniel

[Phil_Seeman]

Hi @Daniel_Perez,

Check out this post and see if it helps:

[Developer tip] How to upload a file attachment to a task

I was recently asked how to use the API to add a file attachment to an Asana task. I know from the API forum section that folks have had some struggles with this, so I wanted to post some working code. Here you go! [One thing to note that trips some people up: the name of the file as sent to Asana must be the literal string “file”. AFAIK any other string for the filename will fail.] Python version: import requests def upload_asana_attachment(task_gid, asana_auth_token, file_path): try…

[Daniel_Perez]

Thank you, @Phil_Seeman !
I’m still getting the same result. See the attach image:

So, the first one looks correct, but when opening the file, it says it’s not supported (this happens with Excel or image files). The second one is actually the hyperlink to where the file is hosted, and it works, but it becomes uncomfortable for the user when files like images are uploaded.

Ideally, I’d like to get it uploaded as an actual file.

Thank you,
Daniel

[Daniel_Perez]

Hi @Andrew_Pegram
Looks like you were able to solve this issue. Are you encoding the file in any way? How does it get attached to the task? As the file as such? Or as a link?

Any insight is greatly appreciated!
-Daniel

Adding attachment to Asana task from Power Automate

Hi, Is there some “trick” to add attachment to a task created from Microsoft Power Automate? If not, could I somehow “write” some code to make Power Automate insert a link instead? I can insert a sharing link to a document in Sharepoint but it can be long URL.

[Daniel_Perez]

I literally fixed it while posting the question!
@Phil_Seeman , @Andrew_Pegram, I removed the quotes around the content file as per Andrew’s post. Additionally, I encoded it using the base64ToBinary function in the expression. The final expression looks like this:
*base64ToBinary(body('Attachment_Get_file_content')?['$content'])*

I hope this can help anyone else!
-Daniel

[Phil_Seeman]

That’s great news, @Daniel_Perez! And thanks for posting your solution for others who follow here.