zotfile cannot automatically move new items to my desired folder

[kiwi1944]

I have installed zotfile-5.1.2 secussfully and set "automatically rename new attachments" by "always rename". Several days ago, when adding new items into zotero, the .pdf document can be automatically renamed and moved to the desired folder. However, I found that it cannot work like this today, while I have done nothing to the settings. The preference "automatically renew new attachments" is still set by "always rename", but new items cannot be renamed and moved to the desired folder automatically.

At present, to remove the .pdf document, I have to manually right click the document, choose manage attachments, and click rename and move. This is time-consuming. I have tried to solve this problem by removing zotfile and install it again, but it does not work. How can I set the zotfile to automatically remove the .pdf document to the desired folder?