preview: no size limit of the app's on an attachment - your Blossom servers decide and a refusal is quoted by name, nothing cuts a slow transfer off, and Cancel exists on a send and a download. Note for this build: on the DEFAULT server list a file over 8 MB is refused by both of ours and goes to the public fallback nostr.download, which is new by default; and a file too big for the phone to hold now fails in words instead of crash-looping.