Most UK builders already log something at the end of the day. The problem is where it lives: a note on a phone, a voice memo, or three photos in a group chat that nobody can find when the insurer calls.
SiteOS treats offline as the default for site capture. Diary entries, snags, time sheets and several checklist flows queue locally and sync when you are back on signal. That is not a nice-to-have for rural extensions and basement digs - it is how sites actually run.
The office still sees the same record. When QS opens the job on Tuesday morning, Tuesday's close-out is already there, timestamped and searchable, not buried in someone's camera roll.
If you are evaluating job-file software, ask one question: what happens when the site manager has no signal at 4pm on a Friday? If the answer is wait until Monday, you will keep losing evidence.