TS2 and LR File Saving

What is the proper way to save a TS2 edited file back to LR. The only way I have found to do it is to remove the default save as suffix in preferences (.studio) and then do an export. If the suffix is not removed and you do an export then it is considered a new file and LR will not recognize it unless you do a file import in LR.

Windows 10.

There are other posts saying that the LR to TS2 edit in external editor is broken. See this post and add anything you want there, Topaz say they are working to fix the problem with External Editor calling: