Hi everyone,

I’m working on a workflow that uploads files from Zoho Creator to specific subfolders in Zoho WorkDrive, as illustrated in the attached diagram. My Creator application form has two multi-file upload fields, and I want—on successful form submission—to automatically send files from each field to a specific subfolder in WorkDrive.

High-level requirements:

• On successful submission of a Zoho Creator form, files from
  File Upload Field 1 → Sub Folder 1 (in WorkDrive)
  File Upload Field 2 → Sub Folder 2 (in WorkDrive)

• The process should support multiple files in each field and work for any future submissions as well.

Attempts and Experiments So Far

1. Zoho Creator Deluge Scripting (invokeurl/WorkDrive API)

• Used various Deluge approaches (both zoho.workdrive.uploadFile and invokeurl) to send files to WorkDrive.

• Implemented file extraction, folder ID mapping, and direct file upload via API calls.

• Faced multiple issues:

  • “Variable 'zoho_oauth_connection' is not defined” error.

  • API error: {"id":"F6012","title":"Number of parameters is more than specified"}

  • “Unauthorized access” errors and other OAuth connection failures.

• Confirmed the Connection exists, and app access is toggled ON.

• Used paid WorkDrive account for testing.

• Tried all recommended corrections for single-file and multi-file uploads.

2. Zoho Flow Automations

• Built scheduled flows to move files from Creator to WorkDrive.

• Faced OAuth connection issues: connections would authorize but disconnect automatically.

• Often received “Unauthorized access” errors at the upload/copy file step.

• Tried multiple browsers, cache clearing, and connection re-creation.

3. Zapier and Other 3rd-party Integrations

• Attempted integrations using Zapier and similar platforms (Make/Integromat, n8n, etc.).

• Most attempts stumbled on either token management or lack of native support for Zoho WorkDrive file upload from Creator.

4. Manual and External Automation

• Considered email-based workflows and external scripts (webhook + cloud function), but want a native, low-maintenance solution.

Current Stuck Points

• Can’t get Deluge, Flow, or Zapier to stably upload Creator form files directly to WorkDrive folders.

• The OAuth connection variable is not always recognized in Deluge.

• Connections in Flow often fail or become unauthorized.

• API requirements (multipart uploads, folder IDs) are met, but authentication consistently fails despite following all recommended checks.

Help Needed

• What’s the current best-practice/native way to send files from Creator file upload fields to specific WorkDrive subfolders automatically?

• Has anyone achieved a similar scenario (multi-file, mapped subfolders) with a reliably working solution?

• Are there hidden requirements, API quirks, or example scripts you could share?

Diagram for reference:

Thanks in advance!
Would deeply appreciate any code samples, working Deluge/Flow walkthroughs, or pointers to community posts that actually worked for this use case.