update power BI server

Hi everyone,

I have an issue,  I’m working with timeline silcer , and now it can be displyed in my reports , it said that the server Power BI can’t support this version, knowing that it worked in the reports that I've created before, server : Version 1.2.6690.34729

I noticed that the timeline version is updated and I didn’t keep the version of the visual timeline that I used before, (Mars 2018)  and I fear if I update it, to lost my previews reports, 

Can I update Power BI server without lost the previews report, when we update server these previews report work well ?

Thank you for help, 

Best regards