Local Drive is one app on five platforms, but a mouse is not a thumb. On a desktop it behaves like a file manager rather than a phone app stretched wide.

Selecting

Action	What it does
Click	Selects that one item
Double click	Opens it
Ctrl click, Cmd click on macOS	Adds or removes one item
Shift click	Selects everything between the last item and this one
Drag on empty space	Draws a box; everything it touches is selected
Ctrl and A	Selects everything in the folder
Escape	Clears the selection
Delete or Backspace	Moves the selection to the trash, after a confirmation

A single click selects rather than opens, which is what Drive and Explorer do. Opening on a single click makes a mis-click cost a page load, and makes selecting several files impossible without a modifier.

The selection bar and the details pane float over the listing rather than appearing beside or above it. That is deliberate: anything that changes the width of the grid reflows the tiles into a different number of columns, and the file you just clicked ends up somewhere else on the screen.

Dragging

Dragging works in both directions.

Inside the app, drag a file or folder onto a folder tile to move it into that folder. Dragging one item out of a selection moves just that item; dragging one that is part of the selection moves the whole selection. A folder lights up only if the move is actually possible, so a target that highlights never fails afterwards.

From the operating system, drag files or folders from Explorer or Finder into the window. The whole window becomes a drop target while something is over it. Release over a folder tile to put the files inside it, or anywhere else to put them in the folder you are looking at.

A dropped folder arrives as that folder, with its shape intact. Local Drive walks it, creates each folder on the server before anything inside it is uploaded, and sends every file to the right place. Nested folders keep nesting, and dropping several things at once works.

Symbolic links are not followed. A link pointing back up its own tree would never finish, and one pointing outside the folder would upload files from somewhere nobody dropped.

Dropping a folder needs the desktop app. A browser can only see inside a dropped folder through a different mechanism, which Local Drive does not use yet, so in a browser tab drop the files themselves rather than the folder.

Menus and dialogs

Right click anything for its menu. It opens at the pointer as a small panel, the way a menu does on a desktop, rather than sliding up from the bottom of the window.

Modals are centred dialogs rather than bottom sheets. This follows the machine and not the window size: a Local Drive window dragged narrow on Windows still has a mouse, a right button and a keyboard, so it still gets desktop controls. Layout follows the width it has; behaviour follows what is driving it.

Uploading something that is already there

If a file being uploaded has a name the folder already uses, Local Drive asks once for the whole batch:

Keep both uploads it anyway. The server appends (2) so both survive.
Replace with the new one uploads it as a new version of the file already there, so the old bytes stay in version history rather than being lost.
Skip these leaves what is there alone.

Nothing is silently duplicated and nothing is silently overwritten.