To use fileIT on Salesforce1 mobile you need to add fileIT to a mobile card on a page layout.
For a custom objects you first need to have created a page then you will need to add fileIT to the page layout.
- Go to Setup.
- Under App Setup click on Create and then click Objects.
- Next click on the object you wish to work with, for example Custom Field Mapping.
- Scroll down to Page Layouts and click Edit.
- Scroll down to Mobile Cards (Salesforce1 only).
- Select Visualforce Pages from the left hand menu.
- Drag and drop File It - Mobile into Mobile Cards (Salesforce1 only).
- Then click Save