We made adding files to records super easy. Just drag them onto a Files or Attachments related list for any object. You can also click the Upload Files button to add files. You get this new functionality automatically— there’s nothing to enable. This change applies to Lightning Experience only. It doesn’t work in Salesforce Classic.
|Related list without any files:||Related list while dragging files:|
We recommend that you use the Files related list instead of the older Attachments related list. Depending on which type of record page you’re on, you might see the Attachments related list displayed as Notes and Attachments.