Post a Feed Element with a New File (Binary) Attachment

This example calls the postFeedElement(communityId, feedElement, feedElementFileUpload) method to post a feed item with a new file (binary) attachment.
ConnectApi.FeedItemInput input = new ConnectApi.FeedItemInput();
input.subjectId = 'me';

ConnectApi.ContentCapabilityInput contentInput = new ConnectApi.ContentCapabilityInput();
contentInput.title = 'Title';

ConnectApi.FeedElementCapabilitiesInput capabilities = new ConnectApi.FeedElementCapabilitiesInput();
capabilities.content = contentInput;

input.capabilities = capabilities;

String text = 'These are the contents of the new file.';
Blob myBlob = Blob.valueOf(text);
ConnectApi.BinaryInput binInput = new ConnectApi.BinaryInput(myBlob, 'text/plain', 'fileName');

ConnectApi.ChatterFeeds.postFeedElement(Network.getNetworkId(), input, binInput);
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