Post a Discord message

Full channel URL, e.g. https://discord.com/channels/<guildId>/<channelId>

When true, the message and any attachment are prepared in the channel but not sent. Nothing is posted: sent comes back false, messageId is null and dry_run is true. Use it to check that a channel, message and attachment are accepted without posting a real, visible message.

Text of the message. Optional when a file is attached, in which case it becomes the message's caption. Up to 2000 characters.

Name the file is posted under, e.g. report.csv. Required whenever fileBase64 is given. Not used with the `attachment` file input, which posts the file under the input's own name.

Optional content type for the attachment, e.g. text/csv. Guessed from the filename extension when omitted.

A file to attach. Preferred over fileBase64 for larger files, as it is not limited to roughly 380 KB. The file is posted under the name of this input, so use fileBase64 + filename instead when the posted filename matters.

Optional file to attach, as base64 bytes, as an alternative to the `attachment` file input. Sent as one message together with the text. Limited to roughly 380 KB of base64, well under Discord's own upload limit. Use this when you need to control the posted filename.

False on a dry run, where nothing was posted.

Content as stored by Discord. Null on a dry run.

True when this run prepared the message without sending it.

ID of the created message. Null on a dry run.

The file Discord stored — null when no file was sent, and null on a dry run.