Uploads fail sometimes, and I think the failure deserves as much care as the success.
- Different entrances
- The file picker, paste, and drag and drop all lead to the same attachment list. The picker also works on touch screens.
- One copy
- Adding the same contents twice keeps a single attachment, even when the filename changes.
- A way forward
- Clear errors explain a rejected file. A failed transfer offers retry and removal without losing your place.