Platform Fields & Media
Every Slack platformSpecificData field and the file requirements.
Media requirements
Up to 10 files per post, uploaded through Slack's file API with the text as the caption.
Slack is the one platform Zernio neither compresses nor transcodes for. It applies no format allowlist here: the bytes behind your URL reach Slack as they are, whatever the type.
The per-file ceiling is therefore Slack's own. Whether an upload succeeds depends on:
- the workspace's upload policy
- on Slack's free plan, its storage cap
A file Slack refuses fails the post with Slack's message.
Zernio names the upload from the media item: type: "video" as .mp4, type: "gif" as .gif, and otherwise from filename.
Host files on a public URL or through the media endpoint, which caps a single file at 5 GB.
Platform fields
All fields go in platformSpecificData on the Slack entry.
| Field | Type | Default | Description |
|---|---|---|---|
threadTs | string | Post as a reply inside an existing thread. The parent message's timestamp, for example "1503435956.000247". | |
unfurlLinks | boolean | true | Expand links in the text into preview cards. |
unfurlMedia | boolean | true | Expand media links into inline previews. |
username | string | (account default) | Override the bot's display name for this message. |
iconUrl | string | (account default) | Override the bot's avatar for this message. |
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