Post a Comment with an Existing File

Make a call to post a comment with an already uploaded file.

To post a comment and attach an existing file (already uploaded to Salesforce) to the comment, create a ConnectApi.CommentInput object to pass to postCommentToFeedElement(communityId, feedElementId, comment, feedElementFileUpload).

String feedElementId = '0D5D0000000KtW3';

ConnectApi.CommentInput commentInput = new ConnectApi.CommentInput();

ConnectApi.MessageBodyInput messageBodyInput = new ConnectApi.MessageBodyInput();
ConnectApi.TextSegmentInput textSegmentInput = new ConnectApi.TextSegmentInput();

textSegmentInput.text = 'I attached this file from Salesforce Files.';

messageBodyInput.messageSegments = new List<ConnectApi.MessageSegmentInput>();
messageBodyInput.messageSegments.add(textSegmentInput);
commentInput.body = messageBodyInput;

ConnectApi.CommentCapabilitiesInput commentCapabilitiesInput = new ConnectApi.CommentCapabilitiesInput();
ConnectApi.ContentCapabilityInput contentCapabilityInput = new ConnectApi.ContentCapabilityInput();

commentCapabilitiesInput.content = contentCapabilityInput;
contentCapabilityInput.contentDocumentId = '069D00000001rNJ';

commentInput.capabilities = commentCapabilitiesInput;

ConnectApi.Comment commentRep = ConnectApi.ChatterFeeds.postCommentToFeedElement(Network.getNetworkId(), feedElementId, commentInput, null);