I just updated Notion and the Tie function seems not to be working, while tie lines appear, their size is not editable, and the notes do not playback as being tied. I did NOT quantize my performance in Notion, would that help?
RE: the answer, is valid. It turns out the issue was my not quantizing to the notation. Once I did that the tie played properly. I did not specify that the tie was a grace note before the beat, so I shouldn't have been surprised that this was an issue. Thank you.