Apex Developer Guide

Getting Started
Writing Apex
Ways to Invoke Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Approval Processing
Authentication
Chatter Answers and Ideas
Chatter in Apex
Chatter in Apex Examples
Get Feed Elements From a Feed
Get Feed Elements From Another User’s Feed
Get Community-Specific Feed Elements from a Feed
Post a Feed Element
Post a Feed Element with a Mention
Post a Feed Element with Existing Content
Post a Rich-Text Feed Element with Inline Image
Post a Rich-Text Feed Element with a Code Block
Post a Feed Element with a New File (Binary) Attachment
Post a Batch of Feed Elements
Post a Batch of Feed Elements with New (Binary) Files
Define an Action Link and Post with a Feed Element
Define an Action Link in a Template and Post with a Feed Element
Edit a Feed Element
Edit a Question Title and Post
Like a Feed Element
Bookmark a Feed Element
Share a Feed Element
Share a Feed Element and Add a Comment
Post a Comment
Post a Comment with a Mention
Post a Comment with an Existing File
Post a Comment with a New File
Edit a Comment
Follow a Record
Unfollow a Record
Chatter in Apex Features
Using ConnectApi Input and Output Classes
Understanding Limits for ConnectApi Classes
Serializing and Deserializing ConnectApi Obejcts
ConnectApi Versioning and Equality Checking
Casting ConnectApi Objects
Wildcards
Testing ConnectApi Code
Differences Between ConnectApi Classes and Other Apex Classes
Moderate Chatter Private Messages with Triggers
Moderate Feed Items with Triggers
Communities
Email
Platform Cache
Salesforce Knowledge
Salesforce Connect
Salesforce Reports and Dashboards API via Apex
Force.com Sites
Support Classes
Territory Management 2.0
Visual Workflow
Integration and Apex Utilities
Finishing Touches
Reference
Appendices
Glossary
PDF

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

In version 36.0 and later, you can’t post a feed element with a new file in the same call. Upload files to Salesforce first, and then specify existing files when posting a feed element.

Important

This example calls the postFeedElement(communityId, feedElement, feedElementFileUpload) method to post a feed item with a new file (binary) attachment. 
1ConnectApi.FeedItemInput input = new ConnectApi.FeedItemInput();
2input.subjectId = 'me';
3
4ConnectApi.ContentCapabilityInput contentInput = new ConnectApi.ContentCapabilityInput();
5contentInput.title = 'Title';
6
7ConnectApi.FeedElementCapabilitiesInput capabilities = new ConnectApi.FeedElementCapabilitiesInput();
8capabilities.content = contentInput;
9
10input.capabilities = capabilities;
11
12String text = 'These are the contents of the new file.';
13Blob myBlob = Blob.valueOf(text);
14ConnectApi.BinaryInput binInput = new ConnectApi.BinaryInput(myBlob, 'text/plain', 'fileName');
15
16ConnectApi.ChatterFeeds.postFeedElement(Network.getNetworkId(), input, binInput);