Attachments

The message editor supports attaching files to your messages, including images, videos, audio, and documents.

Uploading Files

There are three ways to attach files:

1. Click the attachment button (📎) in the editor actions menu
2. Drag and drop files directly onto the editor area
3. Keyboard shortcut — Cmd+U to open the file picker

Supported File Types

Attachment Grid

Attached files appear in a grid above the text editor:

• Type-based icons — Each file type shows an appropriate icon
• File name and size — Displayed below the thumbnail
• Remove button — Click × to remove an attachment
• Loading states — Progress indicator during upload
• Image preview — Images show a thumbnail preview

Attachment Type Grouping

Only files of the same type group can be attached together in a single message:

You cannot mix groups — for example, attaching an image and a document, or a video and an audio file, in the same message. To send different types, send them as separate messages.

Multi-File Attachments

The number of files you can attach per message depends on the channel:

On channels that only support 1 file per message, additional attachments are sent as separate messages automatically.

Upload Validation

Before sending, files are validated for:

• File type — Must be a supported format for the current channel
• File size — Maximum size varies by channel and file type
• Max files — Maximum number of attachments per message (channel-dependent)

Upload Progress

Each file shows upload progress while being sent to the server. Files are queued and uploaded sequentially to prevent overloading.