To add documents to your Zotero desktop library Either select the Choose Files button to browse for the document on your computer OR drag and drop the file into the designated area.Enter and save any of the source's metadata.Create a new item in your library or collection.To add documents to your online Zotero library

In addition to adding a source's metadata (title, author, etc), you can also upload whole documents to your Zotero library, allowing you to directly access a source from the library. If you have a Zotero account synced to the Zotero desktop app, you'll be able to access the new source from anywhere. Once you've added a reference, Zotero will automatically save the information to your library. You can also do this through your online Zotero account by selecting the resource you'd like to change and selecting the Edit button. You can change the reference type, manually edit the reference fields and add Notes and Tags by selecting the tabs above the information fields on the Zotero desktop app.

If adding an item to your library from your online Zotero account, you can attach a link or a copy of the source after you've entered and saved the source's information by using the Upload Attachment button on the following page. Once you've selected your reference type, you'll be able to enter the title, author(s), and other information in the reference fields to the right of the Title box. You can also attach a link or a copy of your reference source to your newly created reference by selecting the Paper Clip icon, located to the far right of the New Item icon. More, which features numerous other source types (see picture below).

If you plan on adding the item to an existing collection, click on the collection first, then click the New Item icon. To add an item to Zotero, click the New Item icon at the top of the page.

Readcube papers citation manager