From The Main Page, Navigate To Cases As Shown:

Click On View Cases As Shown:

Locate the cases you are looking for. Most recent cases will be at the top of the list. You may search by patient name if needed. After locating the case, click the folder as shown:

After clicking the folder, click on upload files as shown:

After clicking upload files, choose the option relevant to your upload. In this case we will use "photos":

Choose browse files, as shown:

At this point, locate the file and click "Open", as shown:

Next, click "Upload Files" as shown:

At this point, you should get a confirmation.