Microsoft SSRS report subscription capability on Power BI server

It depends on what you mean by the "Power BI platform" this forum is specifically focused on Power BI Report Server which is the on-prem install. This product is pretty much SSRS 2017 with the extra capability of rendering pbix reports so pretty much anything you can do in SSRS 2008R2 you can do in PBIRS.

If you are talking about the Power BI Service (ie. powerbi.com) then the ability to render rdl based reports is relatively new. The following docs have some information on what you can do there https://docs.microsoft.com/en-au/power-bi/paginated-reports-subscriptions - it can definitely render to Excel format and send emails. But I don't believe that the service can write to file shares (I think email is the only option at the moment)