alt Hacker NewsIt goes quite far, actually.
A file transfer should remain active even if both devices (source, destination) are physically disconnected, or in network partitions, or when devices are full, need media change, etc.
The only valid states for a file transfer are: ongoing, fully completed with 100% success, or explicitly cancelled by the user with a full usable report of what got copied, fully or partially, and what did not get copied.
The file transfer dialogs and tooling of today's mainstream computing are stuck in the nineties.
Then you will have another control panel or log of ongoing file transfers, which will accumulate waiting transfers over the years a device was used.