src/main/java/com/uploadcare/api/Client.java
public void saveFile(String fileId) {
        URI url = Urls.apiFileStorage(fileId);
        RequestHelper requestHelper = getRequestHelper();
        requestHelper.executeCommand(new HttpPost(url), true);
    }
public void saveFile(String fileId) {
        URI url = Urls.apiFileStorage(fileId);
        RequestHelper requestHelper = getRequestHelper();
        requestHelper.executeCommand(new HttpPost(url), true);
    }
Marks a file as saved.

This has to be done for all files you want to keep.
Unsaved files are eventually purged.

@param fileId Resource UUID