ConnectApi.CommentInput

A comment.

Used to add rich comments, for example, comments that include mentions or file attachments.

Property	Type	Description	Required or Optional	Available Version
`attachment`	`ConnectApi.FeedItemAttachmentInput Class`	Specifies an attachment for the comment. Valid values are: `ContentAttachmentInput` `NewFileAttachmentInput` `LinkAttachmentInput` is not permitted for comments. As of version 32.0, use the `capabilities` property. Important	Optional	28.0–31.0
`body`	`ConnectApi.MessageBodyInput Class`	Description of message body. The body can contain up to 10,000 characters and 25 mentions. Because the character limit can change, clients should make a `describeSObjects()` call on the FeedItem or FeedComment object and look at the length of the Body or CommentBody field to determine the maximum number of allowed characters. To edit this property in a comment, use `updateComment(communityId, commentId, comment)`. Editing comments is supported in version 34.0 and later. Rich text and inline images are supported in comment bodies in version 35.0 and later. Entity links are supported in version 43.0 and later.	Required	28.0
`capabilities`	`ConnectApi.CommentCapabilitiesInput`	Specifies any capabilities for the comment, such as a file attachment.	Optional	32.0
`threadParentId`	String	ID of the parent comment for a threaded comment.	Optional	44.0

Apex Developer Guide