188BET靠谱吗Data need be redownloaded in Zotero ipad, but local storage doesn't disappear

When I resign up in my account in the same device my ipad which I used a lot of times to read many pdf attachements, I find out that all the data have gone and I need to redownload them.However, some data has been fully deleted, I can redownloaded them.All my notes have gone !188BET靠谱吗But I find out that the data do not disappear, because I can discover that the app Zotero occupies 15.27 GB Documents & Data in my ipad's local storage.188BET靠谱吗However, when I see the local storage in Zotero, it only occupies 27.81 MB.So I wonder why the data are saved in local storage, I can't use them and How can I retrieve all the data ?Thank you.
188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u11095813/bxgqzf0js8m9wve1r2tr.png
188BET靠谱吗https://s3.amazonaws.com/zotero.org/images/forums/u11095813/ug9qkr1ad78ygz6tgptb.png
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