Problems downloading Beta version from Connect through Express to Forerunner 245 music

I have an app under development on Connect that I download for testing on to a VA-HR and a Forerunner 245 music.

That process works without surprises when I download to the VA-HR, and it has worked at times with the 245 music.

Now what I'm seeing is I select Download on Connect and select the 245 music.

When I run Express to sync, it syncs and shows the newer version string.

When I unplug the 245 to test the app, the app does not appear.

I plug the 245 back in, use Express, and Express does not list the app.

This has now happened repeatedly.

Somehow.... occasionally... for reasons I have not identified.... the app stays loaded.

Anyone have a solution ?

Thanks