Salesforce does not guarantee all file types and their contained features will properly generate previews in Content. You can read more about this limitation in our "Content file preview issues" article.
Users need to use the 'Files' tab or action to upload documents to be available in Salesforce for Android and iOS. There are some basic requirements that you'll want to keep in mind while uploading content.
Considerations for usage of note-taking tool 'Notes' and 'Files' functionality
Content file preview issues
Work with Salesforce Files
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