Using a standard web browser (or FTP app) on a Mac or PC you can easily transfer files to Infuse (iOS only) so they are available for offline playback.
Step 1. Open Infuse, and select the Add Files option from the Settings menu.
Step 2. Select the Browser item from the left sidebar, and enter the address shown into a normal web browser (Safari, Chrome, Firefox, IE, etc...) on a Mac or PC.
Step 3. Once the page loads, you can transfer videos by clicking the 'Add' button or simply by dragging them into the browser window.