Saving, editing and files on desktop
Saving files on desktop
Wherever the browser would download a file, the desktop app instead opens your computer's own save dialog — you choose exactly where the file goes. The result screen tells you "<file> saved where you chose." once it's done, and the button that starts a save reads Save rather than Download.
"The save dialog could not be opened: <reason>", or "The file could not be written to <path>: <reason>" — try again, and check that the chosen location is still available (for example, a removable drive hasn't been disconnected).
With more than one file to save at once — several images, or several documents exported together — the button reads Save all (<number>) instead of one button per file, so you make one save choice instead of several. The editor's own export dialog uses the same idea: on desktop its finishing button reads "…& save" rather than "…& download", for the same reason the result screens do.
The editor on desktop
The editor behaves exactly the same on desktop as in a browser, including its live previews for things like a watermark or a signature placement. The one visible difference comes right at the end: the button that finishes an export reads "…& save" instead of "…& download" once you're on desktop, because it's handing you the native save dialog described below rather than starting a browser download.
Files on desktop
File Library works the same way it does in a browser (see Files): the same tabs — including Archive, for administrators — the same search and filters, the same row actions. The one difference is files that live only on this device and haven't synced yet — they can be downloaded, edited and deleted like any other file, but they can't be shared or transferred until a sync has carried them to your account, so their row has no Share or Transfer ownership button. A file that only exists on this device can also never be archived — the Archive tab only ever shows documents the online engine kept behind, the same as in a browser.
Folders work offline too. You can make, rename, move and delete folders, and move files between them, without a connection — the folders made on this computer are kept here, and the changes go to your account the next time you're online, in the order you made them. If the same folder was changed both here and somewhere else in the meantime, the online version wins: the folders stay as they are online, and the files on this computer are moved where you put them. A folder you deleted here that still holds files online comes back the next time the list is shown. Signed out, folders stay on this computer only, like everything else.
On Windows, dragging a file onto a folder may not work in the desktop app. Use Move to… on the file's row (or in the bar after ticking files) instead: it does the same, and it always works.