I have added a paper in one of my sub-collection

The paper is in the online library, so it's syncing from the desktop to online.

But on the iPad, I tried to reload, close the app, restart the iPad
But the paper is not there.

For more information:
I am using webdav for file syncing and for data: zotero

I know I need to give debug ID, but I am not sure how to do that