If the download tool prompts "The path is too long", you can change the path to the root directory of the corresponding storage. After the download is complete, cut and paste it to another directory.
Similarly, before operating the file that cannot be recognized because the path is too long, you can cut and paste the folder where it is, or the entire collection folder, into a shorter path.
The source of each item can be found in the TXT file "source of each batch of files" in the root folder of the collection (各批次文件的来源) and "source of external danmu" (外挂弹幕的来源).