---
title: "Add file to a matter"
method: POST
path: "/matters/{matterId}/documents/files"
tags: ["Files"]
---

# Add file to a matter

`POST /matters/{matterId}/documents/files`

Registers a new file on the matter and returns a presigned PUT URL (valid for 1 hour) to upload its content.
The file is created only after the content has been PUT to the URL and confirmed by the storage callback;
the 'Location' link to 'GetFileById' returns 404 until then.
            
'fileName' is split on the last '.' into name and extension. The name is normalised to XML-safe characters and
must contain at least one valid character.
'folderId' and 'folderPath' are mutually exclusive (400 when both are set). 'folderId' is not validated for
existence or matter membership; an unknown value is accepted as-is.
Additional data values must be strings, integers, numbers, booleans or null; keys must not be blank.

## Path parameters

- `matterId` string, required

## Request body

- AddFileDto
  - `fileName` string, required — Full name of the file including the file extension. Required, maximum 256 characters. The name is split on the last '.' into name and extension, and the name is normalised to XML-safe characters. It must contain at least one valid character after normalisation.
  - `folderId` string, nullable — Unique identifier (GUID) of the folder to add the file to. If null (and FolderPath is not set) the file is placed in the root folder. Mutually exclusive with FolderPath. The folder is not validated for existence.
  - `userId` string, nullable — Unique identifier (GUID) of the file owner. If null it will fallback to the authenticated user
  - `folderPath` string, nullable — Path of the folder to add the file to, relative to the matter root, with '/' separating folder names. Mutually exclusive with FolderId: set at most one of the two. If neither is set the file is placed in the root folder.
  - `fileAdditionalData` object, nullable — Dictionary of custom metadata to store against the file. Keys must not be blank. Values must be strings, integers, numbers, booleans or null; objects and arrays are rejected.
  - `dateCreated` string, date-time, nullable — The original datetime that the file was created. If null the current datetime will be used
  - `dateModified` string, date-time, nullable — The initial datetime that the file was last modified. If null the current datetime will be used

## Response `202`

When request is accepted. Returns an 'UploadFileInfo' object.

- UploadFileInfo
  - `fileId` string, nullable — Unique identifier of the file.
  - `uploadUrl` string, nullable — Temporary presigned URL to upload the file content to. Send the raw file bytes with an HTTP PUT request. The URL is valid for 1 hour from the time of the API call (see Expiry). Important note: When uploading to this URL, set the 'Content-Type' header to an empty value. Example cURL: curl --location --request PUT 'URL_GOES_HERE' \ --header 'Content-Type: ""' \ --data '@/C:/dir/test.pdf'
  - `expiry` string, date-time — UTC date/time when the upload link is no longer accessible (1 hour after issue).

## Other responses

- `400` — When the supplied matterId is not a valid GUID; when the body fails validation; when the file name contains no valid XML characters; when both 'folderId' and 'folderPath' are set; or when the additional data contains a blank key or a non-primitive value.

---

[API](https://skmtc.dev/smokeball/apis/api.md) · [All operations](https://skmtc.dev/smokeball/apis/api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/smokeball/api/revisions/db1b8a86b58e/schema)