This article explains that the "My Drafts" filter is not available in the Chatter feed on the Salesforce Mobile App. This is the application's expected behavior.
The "My Drafts" filter is not available in the Chatter feed on the Salesforce mobile app, unlike the desktop version.
As additional information, the label for the "Company Highlights" filter is displayed differently between the desktop and mobile versions when the language is set to Japanese.
Desktop version (Japanese): 会社の注目
Salesforce Mobile App (Japanese): 会社の特長
Chatter: What’s Different or Not Available in the Salesforce Mobile App
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