How to refresh a project?

Hi

I edited a file in external editor, then, Rider don't find the file.

For example, I do "echo aaa > a.cs" In terminal.

I want a.cs to be visible in Rider, but Rider doesn't recognize it in Solution Explorer.

I try ways:

* "Unload Project" and then "Reload Project"

* Build > Clean Solution

but make no sense.

Also I try "Close Rider.app and Open Rider again" is good.

But having some trouble reopening Rider when I edit any files in external editor, including VCS(git).

Is there any way to "refresh" project like Eclipse.

I use mac, High Sierra.

Thanks!