public Uri writeFileToFolder(final PersistableFolder folder, final FileNameCreator nameCreator, final File file, final boolean deleteFileOnSuccess) {
        return copy(Uri.fromFile(file), getFolder(folder, false), nameCreator, deleteFileOnSuccess);
    }
Write an (internal's) file content to external storage
main/src/main/java/cgeo/geocaching/storage/ContentStorage.java