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Frequent Visitor

Custom connector for Box Upload API



I am running into an issue creating a custom connector that will upload a pdf file to box folder.  I am configuring the custom connector with the BOX Upload API.  I have postman setup properly to upload file but when I import them to custom connector it does not configure properly.   Below is working postman command that uploads file to box.



 The BOX Upload API uses a post with the body in form-data and two keys, the attributes key and file key.  The attributes key has the file attribute, like file name, what box folderid to put the file in, etc.  I am having a hard time building this part out in custom connectors.




Has anybody here have any success or have done any box custom connector using upload api?  Would appreciate some insights, thanks!


Accepted Solutions
Frequent Visitor

Solved!  This is formatting on the API.  Once formatted correctly, box was able to handle request.

View solution in original post

Frequent Visitor

Might be making some advancements...but think multipart section might be some formatting issue?  Errored is NotFound and output was 404.






Frequent Visitor

Some more progress, the response is a 400, "API upload did not contain a file part"  So I know its a formatting issue.




My flow details look like this:





The raw request:


"host": {
"connectionReferenceName": "shared_box-20upload--",
"operationId": "Uploadfile"
"parameters": {
"Content-Type": "multipart/form-data;boundary=WebKitFormBoundary7MA4YWxkTrZu0gW",
"body/$multipart": [
"headers/Content-Disposition": "form-data; name=\"attributes\"",
"value": "{\n \"name\": \"test11.pdf\",\n \"parent\": {\n \"id\": \"142982795411\"\n }\n}"
"headers/Content-Disposition": "form-data; name=\"file\", filename=\"\"",
"value": {
"@odata.type": "#microsoft.graph.fileAttachment",
"id": "AAMkADExNjVhMzg0LWQyMTEtNDNkYi05YWE3LTYwMDk1OGE1YTJmYQBGAAAAAAAbdnwb3G2yR7Pj0aWJn6DTBwBfi9w1M-rwRqySYi6aOKx_AAUvV8t_AABfi9w1M-rwRqySYi6aOKx_AAUzpl0KAAABEgAQACiSHdJ6iRlHqkaX5_xdF3k=",
"lastModifiedDateTime": "2021-12-01T20:58:43+00:00",
"name": "Order_7357678#en-US_Ordered_PacificStandardTime.pdf",
"contentType": "application/pdf",
"size": 102452,
"isInline": false,
"contentBytes": "JVBERi0xLjQ-----etc"




Frequent Visitor

Solved!  This is formatting on the API.  Once formatted correctly, box was able to handle request.

Frequent Visitor

@Daveyyydave What was the correct formatting? Running into same issue.

How did you solve it? Running into same issue.

Frequent Visitor

@Shimoyama we got it to work with this: 


where "Outputs" in the body is:


Frequent Visitor

Please tell me all the steps to create the flow.
I still get the error.

Frequent Visitor

First dynamic input is the filename and varfolder is the folder ID.


The body of the above is:


  "grant_type": "client_credentials",

  "client_id": "",

  "client_secret": "",

  "box_subject_type": "enterprise",

  "box_subject_id": "",

  "scope": "root_readwrite"


fill in your own client id, client secret and box id.

Then compose using binary of the varBinaryCode.


Full json above:

    "properties": {
        "access_token": {
        "expires_in": {
        "restricted_to": {
        "token_type": {
Then the upload step I already sent that starts with this. 


Frequent Visitor

@abc4swc is there any chance you could paste the swagger for your connector please?
I'm also struggling to get this going for a custom Box connector, but even after making the suggested changes in this thread, I'm getting the same "code 400" response as you.

Frequent Visitor

Managed to solve it.

For anyone else struggling, use the swagger below & then adjust your auth mechanism to suit.


swagger: '2.0'
  title: Default title
  description: ''
  version: '1.0'
basePath: /api/2.0
  - https
  - multipart/form-data
produces: []
      summary: Direct Upload
      description: Direct Upload
      operationId: Direct_Upload
        - name: Content-Type
          in: header
          required: true
          type: string
          default: multipart/form-data; boundary=---MultiPartUploadBoundary
          description: Content-Type
          x-ms-visibility: internal
        - in: formData
          name: attributes
          type: string
            type: string
          required: true
          description: >-
            An array containing the file name and parent folder id for this
        - in: formData
          name: form-data
          required: true
          type: file
          description: default
          schema: {}
definitions: {}
parameters: {}
responses: {}
    type: oauth2
    flow: accessCode
    scopes: {}
  - oauth2-auth: []
tags: []

Then once saved, format the task as follows,


attributes= { "name": "file.ext", "parent":{"id": "targetBoxFolderId"}}

body= the file being uploaded (file content)

form-data= @file.ext, type=file-content-type

Not applicable

Does this flow also work for a pdf file type?

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