We are migrating to Lightning and we just converted Attachments to Files. Now we recently noticed that, Files associated to Opportunities are not available to view under Accounts which was default behavior of Attachments. Guess it's a Lightning feature. Is it so? Our Reps are interested to see the Files of all linked Opportunities under Accounts. Is there any way to do that, without copying file to Accounts also? And there is no way to customize Files related list? We want to add description field into the Related list.