Using workflow rules you can trigger emails, tasks or actions based on changes to files within a folder. Workflow gives you the flexibility to choose the criteria for these actions.

Below I've included the steps to create a workflow rule to notify you when a file is uploaded to a specific folder.

Building the workflow rule

Within the workspace Files & Discussion tab, select the Options menu at the top right, select Workflow

Select the New Workflow Rule button to build your rule

Name the rule and select Email Notification
Select the folder to apply the rule to. You can select multiple folders and decide if you want to include subfolders
What action do you want to trigger the notification? choose uploaded, edited, deleted or moved from the folder
Choose which members will receive the notification
Below these options, you can customize the email that you will receive
Save the workflow rule. Test the rule by uploading a file to the folder to get the email notification