Files was a screen that browsed one folder on your Mac. Current Mac builds do not show it, because Projects took its place. This page says what it was and where to look now.
Mac appNot availableBuilt, but not shown. Projects replaced it in 1.3.61.
Windows appAvailable
Not in the Mac app today
There is no Files row in the sidebar of current Mac builds, in the normal view or the advanced view. Since version 1.3.61, Projects is in its place. The screen is built but switched off for every customer. If a customer asks where Files went, point them to Projects.
Files was a plain browser for one folder: the folder the app had open. It is useful to know what it did, because older chats, notes and screenshots may still mention it.
What it was
A table of the files and folders in the open folder, with the columns Name, Type, Size and Modified. You could sort by any column and go up to the folder above.
Right-click an item, or use the File menu, for:
New File… and New Folder…
Rename… and Duplicate
Get Info, Quick Look and Live Preview
Add to Chat and Remove from Chat
Reveal in Finder and Copy Path
Move to Trash, which asks first and says you can restore the item from the Trash
Opening several items at once asked Open 3 items? and said each would open in its own app or window.
Where to look now
A project's files. Add folders, files and web pages on a project's Sources tab. See Project sources.
Files Haruno made. They show as cards in the chat, and in the Artifacts list of the side panel. See The side panel and Activities. A document can be read in the Preview panel.
Giving Haruno a file. Use the plus button beside the message box, or drag the file onto it. See The message box.
A company's own files. A company's page has a Files tab. It is a separate thing. See Company page.
In the advanced view, clicking a file's name in a reply shows the file in its project, or in Finder.
Why it went
Haruno no longer asks you to open a folder before you can chat. A chat works in a folder of its own, or in its project's, and ⌘O opens or creates a project. With no single open folder, a screen that browsed it had nothing to show. See Projects.
Who has it
Nobody in current builds.
What to tell a customer
There is no Files tab any more. Work is kept in Projects. A customer who wants to look inside a folder uses Finder, or links the folder to a project.