Letting others add content to a folder you created
In this example, Jane Smythe has full access to her Plone site. She
can add, edit, delete and publish content anywhere in the site. For
now, she has created a folder called "Documentation" and added one Page
to it, "Project Overview". She hasn't published either the folder or
the document. The default workflow for this Plone site has not been
modified.
Now she wants to let her colleague, George Shrubb, add
content to the Documentation folder. He have permission to edit any of
the existing content, but she needs him to start adding content. Before
we follow along with Jane, let's take a peek at what George currently
sees when he logs in on this Plone site:

Notice that as of right now, George can't even view the Documentation folder, because Jane created it and it is still in the Private state. All the default permissions are currently in place and work as expected.
Jane gives George the permissions he needs to add content to the Documentation folder.
Jane navigates to the Documentation folder and clicks on the Sharing tab:

One of the first things to notice is that Jane already has all the permissions available for this Folder. These permissions were actually granted from higher up in the site as indicated by the green/check mark symbol.
In this example, Jane will grant George "Can add" permission on the "Documentation" folder so that he can add content to the folder. First, she searches to find him by his name:

Jane can now add specific permissions for George in the "Documentation" folder. She is going to give him the "Can add" permission and then click on "Save":

And that's all there is to it! Let's see how George views the site now.
Note: George does NOT need to log out and log back in. Permissions are always current because they are checked every time a user accesses anything (e.g. clicks on a link) on a Plone site.
George clicks on the Home tab (for example) to refresh his view of the site and can now see the "Documentation" folder:

When George clicks on the "Documentation" tab, he notices that he can view all the content in the "Documentation" folder, and he now is able to add the available content types to the folder, as shown in the Add new... menu:

George wants to review what Jane has already created, so he clicks on the Project Overview link and sees:

While George can view the document, his limited permissions do not allow him to edit it or change its state. The only thing he can do beyond viewing the document is to make his own copy of it.
George adds a Page called "Widget Installation" and creates the content for that Page. When he's done he saves it:

Jane views the work George has done. She clicks on the "Documentation" tab and sees that George indeed has been busy. She clicks on "Widget Installation" page to take a closer look:

Notice that Jane has full access to the page that George created. She can edit it as well as cut/copy/paste it. Instead, she will wait until George submits the page for review before actually doing anything further with this page.
