I just tried to publish a map to AGOL and got a lot of errors after "Analyze" because all my labels contain the Shape_length field which it didn't like.
![IlkaIllers1_0-1637943092839.png IlkaIllers1_0-1637943092839.png](https://community.esri.com/t5/image/serverpage/image-id/28309i48AD985525D47588/image-size/medium?v=v2&px=400)
Why not? I had to open all feature classes, add a field, copy the shape_length into the new field, rewrite the labels and only then I could share it. Very annoying and not understandable why!