A project file only stores the paths of media files (including video, audio, and image files), not the entire file contents. When a project file is loaded, it attempts to find and load the media files using those file paths. If a media file has been moved or deleted, or the project file alone has been copied or moved to another computer, Express Animate will not be able to find the original media files.

To back up a project and all its media files, or to move a project and all its media files to another computer, select File -> Back Up Project Files to Folder. This will save a new copy of the project (.apj) file in the selected folder, and all media files used in the project will also be copied into the same folder. This entire folder can then be saved to backup media, copied or moved to another computer.