Here's how you can easily rename a file in two convenient ways:
Method 1: Rename directly from the file list
Hover your cursor over the file name.
Select the Edit icon that appears next to the filename.
Type the new file name.
Press Enter on your keyboard to save your changes.
Method 2: Rename while previewing the file
Select the file you'd like to preview.
Select the pencil icon next to the file name on the right side of the page.
In the File Name box, enter the new name for your file.
Select the green checkmark to the right of the File Name box to save changes.