@Rob-Veerman said:
You're not alone, actually one of many. It's an issue that is reported to Garmin by iPhone users in combination with a Garmin Zumo XT. Garmin is aware of the problem and is working on it. You could use the Connector app and connect your device with an usb cable to your computer.
This isn't the first time that Garmin has broken the Drive app, resulting in connection problems to the XT. And it likely won't be the last...
Using the wired USB cable from your computer to the XT is the best alternative. In my view, it's the best option of all. Doing a GPX file copy is simple, and if you do it manually, you can copy directly to an SD Card inserted in your XT. It's beyond the scope of this topic, but an SD Card has advantages vs. internal storage.
Moving on to the XT2/XT3, Garmin is making it more unreliable to copy routes via their app. The Tread app is used for the XT2/XT3, and using the app for transfer can cause problems for route re-calculation. If you want to continue with Garmin's beyond the original XT, it's a good idea to get used to wired transfers now.