Start async conversions after Slack approval
A single reaction can start the heavy file work without blocking anyone.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Async Convert
Tool to perform an asynchronous file conversion. use when converting large or long-running files to avoid client timeouts.
Why this helps
Large conversions wait in chat because nobody wants to trigger a timeout-prone job manually.
- Adds a clear approval checkpoint
- Avoids client timeouts
- Keeps expensive processing intentional
Setup
Build it in a few focused steps.
- 1Connect Slackbot and Convertapi once in Notis.
- 2Create an automation named Approval Reaction Long Conversion.
- 3Tell Notis to read the approved message for its file source and start an asynchronous Convertapi conversion, then report the job id.
- 4Pick Message Reaction Added as the trigger and choose a report channel.
- 5Test by adding the chosen reaction to one real file request.
Questions about this workflow
Can the reaction represent approval?
Yes. In the instruction, specify which reaction should count as approval.
Why use async conversion?
It is designed for large or long-running files that could outlast a normal request.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slackbot to Convertapi. A trigger fires from one place; an action lands in another.
Slackbot triggers
Convertapi actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Async Convert
Tool to perform an asynchronous file conversion. use when converting large or long-running files to avoid client timeouts.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Delete Async Job
Tool to delete a previously created asynchronous conversion job. use when the job is no longer required to free server resources.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Delete Uploaded File
Tool to delete a previously uploaded file. use when the file is no longer needed and should be removed from temporary storage.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Get Supported Input Formats For Output
Tool to list all input formats that can convert to a specified output format. use after deciding the target output format.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Convert PDF to DOCX
Tool to convert pdf files to docx format. use when you need editable word documents from pdfs. provide pdf content or url and receive docx file metadata and download links.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Convert PDF to JPG and Store
Tool to convert a pdf to jpg and store the result on the server. use when individual jpg pages are needed for further workflow steps.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Upload File From URL
Tool to upload a file directly from a remote url. use when you need to import files hosted on a remote server without downloading locally.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Upload File (Multipart)
Tool to upload a file via multipart/form-data. use when you need to store a file on convertapi's servers (up to 3 hours) and obtain a fileid for subsequent conversions.
Connect any two apps with Notis in the middle.
Slackbot and Convertapi, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
Save your first hour today.
7-day trial of any paid plan, with 20$ of usage included.
No card. Works with personal or business Convertapi.