undo publish on web server

Hi,

I wanted to know whether we undo the changes after we publish the pxix to the web.

I made some charts in the web, and wanted to create some new measure, so edited the pbix and published it.

After I published, the charts i created on the web disappeared and now I'll ahve to rework everything.

Moreover, I downloading the pbix from web but wasn't successful. The copy downloaded was invalid or corrupted.

Please help