I was going to say “it works for me”, but it doesn’t! Sneaky little bug.
I was testing/using GPX export from timeline view a fair bit when building the GPX importer, so I guess it must’ve snuck in … well, I’d guess that it snuck in then, but if you think it’s been around a bit longer, then the mystery deepens.
I’ll have a poke around and see what I can find. Hopefully it’s something simple. Oh I wonder if it’s actually due to an iOS update. That “Save to Files” sheet is part of iOS, so I wonder if something changed in that layer and Arc now needs to act slightly differently. Hmm.