Re the last couple of posts - I’m sure most users of SyncThing aren’t interested in Android vs. iOS debate. Fact is that the growth of SyncThing depends on getting as many users and platforms to adopt it as possible. (If indeed growth is seen as good here, which it may not be I suppose.)
I made a sideways glance at this in my post, i.e. said I’d rather not pay for a third party app. After writing that and posting above, I decided that was a silly thing to say given SyncThing is open source and, although iOS App Store allows for free software, it’s more suited to developers who give commitment to their apps over a long period hence needing to charge at least a small amount. So I purchase Möbius last night after having had it installed for a while with small amount of data. Generally quite pleased with it.
Since the initial posts on this thread, Apple have made background processes work very well and I woke up this morning to find about 60GB of files had synced fine despite using my phone in the evening after installing the app. Also had a nice notification saying how long Möbius sync had run in the background over the last 24 hours, so that’s useful.