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Adding folders is a key feature of Document Libraries in Sharepoint Online. It allows users to better organize files and keep things up to date. One of the main advantages to Folders in Sharepoint is that you can share a direct link to that folder with other Sharepoint users. Keep in mind, though: user permissions are inherited from the document Library- which means the users you are sharing with will need access to that library first, or you will need to grant them access specifically to that folder.
To add folders to your Sharepoint Document Libraries:
- Navigate to the Document Library
- Click “New” and select “Folder”

To share this folder, or add it to a Quick Links webpart:
- Click “Copy Link” to get the URL

Navigate to Home page of your Sharepoint.
- Click “Edit” to get the site into Edit mode

- Click in the Quick Links web part to activate the edit mode for that Web part
- Click “Add a Link”

- When the file window pops up, click “From a Link”
- Paste the link into the box and click “Add”

To change the properties of the link:
- With the web part selected while in edit mode:
- Click on the link
- Click the slider link to edit the link properties. This will open the toolbar
- From here, you can edit the link URL, Title and Thumbnail
