Dropbox: Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B

Dropbox files.uploadSessionStart: arguments, response, policy and SDK examples.

Operation dropbox.files_upload_session_start

Provider route: POST /2/files/upload_session/start. Alter supplies the connection’s credentials and routing.

Call through Alter

Install @alter-ai/sdk @alter-ai/dropbox with npm, or alter-sdk-dropbox with pip. Supply your connected customer’s grant ID and the arguments described below.

import { App } from "@alter-ai/sdk";
import { DropboxIntegration } from "@alter-ai/dropbox";

async function execute(input: Parameters<DropboxIntegration["files"]["uploadSessionStart"]>[0]) {
  const app = new App({ apiKey: process.env.ALTER_API_KEY! });
  try {
    const provider = new DropboxIntegration(app, { grantId: process.env.PROVIDER_GRANT_ID! });
    const call = await provider.files.uploadSessionStart(input);
    const result = await call.wait();
    return result.bodyJson();
  } finally {
    await app.close();
  }
}

import os
from alter_sdk import App
from alter_sdk_dropbox import DropboxIntegration

async def execute(arguments):
    async with App(api_key=os.environ["ALTER_API_KEY"]) as app:
        provider = DropboxIntegration(app, {"grant_id": os.environ["PROVIDER_GRANT_ID"]})
        call = await provider.files.upload_session_start(arguments)
        result = await call.wait()
        return result.body_json()

Input

Field	Type	Presence	Description and constraints
`$`	object	Root	Additional keys: not allowed
`headers`	object	Required within parent	Additional keys: not allowed
`headers.Dropbox-API-Arg`	Model	Required within parent	Expand Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — request body — headers Dropbox-API-Arg
`headers.Dropbox-API-Path-Root`	Model	Optional	Expand Deletes a group — request body — headers Dropbox-API-Path-Root
`headers.Dropbox-API-Select-User`	string	Optional
`headers.Dropbox-API-Select-Admin`	string	Optional
`body`	object	Required within parent	Additional keys: not allowed
`body.filename`	string	Required within parent	Minimum length: 1
`body.content_type`	string	Required within parent	Minimum length: 1
`body.content_base64`	string	Required within parent

Referenced models: Deletes a group — request body — headers Dropbox-API-Path-Root, Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — request body — headers Dropbox-API-Arg

Response

Response media type: application/json. The table describes the pinned successful response. Referenced models link to their complete fields.

Field	Type	Presence	Description and constraints
`$`	Model	Root	Expand Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — response body

Referenced models: Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — response body

Schemas

Deletes a group — request body — headers Dropbox-API-Path-Root

Field	Type	Presence	Description and constraints
`$`	JSON	Root
`$ (anyOf 1)`	string	Alternative	One of: home
`$ (anyOf 2)`	object	Alternative
`$ (anyOf 2)..tag`	string	Required within parent	Must equal: home
`$ (anyOf 3)`	object	Alternative
`$ (anyOf 3)..tag`	string	Required within parent	Must equal: root
`$ (anyOf 3).root`	string	Required within parent	Pattern: ^(?:[-_0-9a-zA-Z:]+)$
`$ (anyOf 4)`	object	Alternative
`$ (anyOf 4)..tag`	string	Required within parent	Must equal: namespace_id
`$ (anyOf 4).namespace_id`	string	Required within parent	Pattern: ^(?:[-_0-9a-zA-Z:]+)$
`$ (anyOf 5)`	object	Alternative	A tag this contract version does not list (Dropbox's other).
`$ (anyOf 5)..tag`	string	Required within parent	Pattern: ^(?!(?:home\|root\|namespace_id)$)

Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — request body — headers Dropbox-API-Arg

Field	Type	Presence	Description and constraints
`$`	object	Root
`close`	boolean	Optional
`session_type`	JSON	Optional
`session_type (anyOf 1)`	Model	Alternative	Expand Start a batch of upload sessions — request body — body session type value
`session_type (anyOf 2)`	null	Alternative
`content_hash`	JSON	Optional
`content_hash (anyOf 1)`	string	Alternative	Maximum length: 64 Minimum length: 64
`content_hash (anyOf 2)`	null	Alternative

Referenced models: Start a batch of upload sessions — request body — body session type value

Upload sessions allow you to upload a single file in one or more requests, for example where the size of the file is greater than 150 Mi B — response body

Field	Type	Presence	Description and constraints
`$`	object	Root
`session_id`	string	Required within parent

Start a batch of upload sessions — request body — body session type value

Field	Type	Presence	Description and constraints
`$`	JSON	Root
`$ (anyOf 1)`	string	Alternative	One of: sequential, concurrent
`$ (anyOf 2)`	object	Alternative
`$ (anyOf 2)..tag`	string	Required within parent	Must equal: sequential
`$ (anyOf 3)`	object	Alternative
`$ (anyOf 3)..tag`	string	Required within parent	Must equal: concurrent
`$ (anyOf 4)`	object	Alternative	A tag this contract version does not list (Dropbox's other).
`$ (anyOf 4)..tag`	string	Required within parent	Pattern: ^(?!(?:sequential\|concurrent)$)

Policy, approvals and errors

SDK function policy ID: dropbox.files_upload_session_start. Catalog operation: files/upload_session_start. Rules can name either ID; function rules distinguish managed calls and conservatively cover raw calls sharing the route. Existing grant permissions and policy rules apply. wait() returns an immediate result or waits for a required approval; it never approves the request itself. Persist the approval ID to resume after a restart.

Provider errors retain their response; JSON decoding raises ProviderAPIError for provider failures. ManagedOperationError identifies contract/input/retention errors. See error handling and provider-specific behavior. Sensitive input may be refused before approval storage. A decoding error never resubmits a write.

Required provider scopes: ["files.content.write"]

Official provider source

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