When enabling the Expenses app for Salesforce Mobile, the Administrator should consider that users should be able to create records, attach receipts as photos, and submit for approval. This is described in option D.

Option A is incorrect because searching Salesforce records and approving records from Chatter are not related to the Expenses app.

Option B is incorrect because creating list views is not necessary for creating and submitting expense reports.

Option C is incorrect because record push notifications from Chatter are not specific to the Expenses app and may not be relevant to users who are focused on submitting expense reports.