Good afternoon @ErickVereau,
Thank you for posting. I am seeing this bug fixed, however, I think there may be a step missing in the workflow. See my video below -
You will still see the same message - Data already belongs to a hosted layer unless you delete the layer from the TOC.
- Add a layer from Excel
- Share the layer to AGOL/Enterprise
- Delete the layer from the map
- Try to add the layer from Excel again
Let me know your outcome!
Best,
SC
Shannon Cardoza
Product Engineer