Hi @SarahLaverty, thanks for your reply 
Cheers for the tip on how to download a ride file and manually upload it to TR. I might use that in future, but tbh now that I realise that any such rides wouldn’t be taken into consideration by the adaptive training AI (yet!?) I’m not too worried about it. Happy to have some “secret miles” on the ebike haha!
And yeah, that ride on the 5th did sync just fine, as did a few other ebike rides the previous week or so. For some reason that I don’t understand (an app update, perhaps?) for a brief period, rides that were being recorded on the Bosch app synced to Strava as “ride” not “ebike ride” and were therefore appearing on Trainer Road too. That’s when I was like “oh this is actually quite cool” and did a bit of digging on this forum to figure out if ebike rides could sync to TR. But my experience has been that if an activity on Strava is recorded as “ebike ride” initially and then I manually change it to “ride”, it just doesn’t register with Trainer Road.
Being pretty new to Trainer Road, I have to say I’m very impressed with it and I’m really enjoying the whole experience of training using the app. I look forward to future improvements that will make a great thing even better!