According to some embodiments, a proxy server comprises one or more processors operable to establish communication with a secure client application of a device. The client is configured with a partition that contains data received from the proxy server within the secure application. If the client passes authentication, the server communicates preview information to the client previewing files that the server received from a business server on behalf of the client. The client requests a selected file. The server renders the selected file into a first portion and a second portion based on the immediate display capabilities of the client. The server communicates the first portion, determines that a trigger point was reached, and then communicates the second portion in response to the trigger point being reached. The client is configured to delete the first portion and the second portion in response to a completion event.