You can search for, rename, or delete files in your space in the Files panel of your space. Below the file upload section, you'll find the file listing. Each file has an action menu that lets you download, replace, rename, or delete your file. At the top of the file listing section, there is a search box, where you can search for your file by its name, and a sort toggle, which will let you sort your files by the date they were last modified, or their size.