MobileCode can read the files you browse to open in it. These files are only edited in place and not shared to any location external to the local app on your device or the folder the file originally resides in. A backup is made when opening a file, and it can be deleted with 'Clear backups' on the Backups page. There is a log file of app activity stored in the private app directory. This log file is private to the app and not shared anywhere. When downloading a URL, MobileCode uses the http functionality built into iOS to send a GET request to the URL. When a crash happens, MobileCode sends a stacktrace via POST https to a server for debugging purposes. This stacktrace includes the platform, version of the app, and for each entry of the callstack, the name of the library, function, load offset, and program counter location.