All of the files were in Favourites…
Conclusions…
Using Tread and bluetooth to transfer files from my iPad to the Garmin is not reliable.
Transferring files via sd card works perfectly, but finding out where the Garmin puts the files requires some sleuthing.
I’m glad that I still use the numbering ...

I think I have it figured out…enough for today. The logic of the process is odd…
I’ll create and save a route when the weather improves enough to go for a ride..

@CollingsBob

Thanks for the gpx file you PMd. I contains both a route and a matching track.
I first imported to Basecamp and all looked good there.

Next I copied your original file to the Garmin/GPX folder on the sd card in my XT2 and then rebooted the XT2.
I think the XT3 is similar, but might ...

Nope…

Yes…I opened the route ..and started it..

Well….That’s odd. I created a route…Winnipeg - Thunder Bay and saved it in “Saved”..but now I cannot locate the “Saved” folder/location…The File is in “Collections” though..

Will do..

Ok…I read all of your suggestions..and I thank each and every one of you for taking the time to respond.
I saved all of the gpx files in .gpx 1.1 Here/Garmin format onto a sd card..and put the card into the Garmin..
Voila..the Garmin imported the files…all 26 of them - I had saved the Routes as ...

I use MyRoute App for creation..
All of the files look ok in that App…and I have saved them in the correct format..and I used that program to create and load gpx files for the BMW Connected Ride Navigator..

I have done a complete reset on the Garmin…three times.
When I tap the sync arrows in Tread ...

Ok…a small step. I discovered that the labels for the .gpx files were in the garmin, but not the files.
So…I deleted the Bluetooth pairing in my phone, then re-created it.
Then Confirmed that the unit was connected to my phone..
Then I selected all of the files in Tread
Then I hit “sync” in Tread ...