iOS — Select and display the document from the Documents section of CaseManager. Press the Open In button at the top right of the screen, and from the list of compatible applications, select the desired application. The document or photo will open in the selected application, where you can annotate or edit it. When you have finished, utilize the Open In button to transfer it back to CaseManager.
Android — Start the desired third-party application and open the desired document or photo by locating it in the folder from which it was originally added to CaseManager. When you have finished working with the document or photo, save it back to the original folder. Open it in CaseManager as you did originally, using the + symbol in the CaseManager/Case/Documents section and selecting the item from the original folder.