At the moment markups made in a previous file version do not display if the sheets names change between file versions. This is a huge issue, can you please change the process to set the markups to link to sheet ID and not sheet name. It is more than current for sheet names & numbers to evolve, therefore loss in data could happen more often than wanted and this is therefore far from a BIM process.
As an example we have just changed approx. 20 sheets to a new naming convention given to us by the client, result of this change has lead us to the loss of approx. 150-200 markups......
Link to issue:
https://knowledge.autodesk.com/support/bim-360/troubleshooting/caas/sfdcarticles/sfdcarticles/Markup...
This is an urgent matter for all BIM360 users