Any idea why defining my SaveAs Filename:= in VBA isn't populating the file name field in the Save As dialogue box?

I've got a report that runs weekly, and I'm working on putting in a button that the user can click that will do a sanpshot -- SaveAs in the correct place on sharepoint, then delete the data connections. I've done this before and it worked to put the path in, but it's not populating the name and I feel like it should.

savepath = "https://myorganization.sharepoint.com/myintranet/Development/Development Services/Reporting/Weekly Gift Reporting/Weekly Gift Report Archive/" SaveInfo = Application.GetSaveAsFilename(InitialFileName:=savepath & _ "Weekly Gift Report " & _ Format(Range("StartDate"), "yyyy.mm.dd") & "-" & _ Format(Range("EndDate"), "yyyy.mm.dd"), _ filefilter:="Excel Macro-Enabled Workbook(*.xlsm), .xlsm") wkb.SaveAs Filename:=SaveInfo, FileFormat:=xlOpenXMLWorkbookMacroEnabled 

The SaveAs dialogue box opens up to the correct folder but the filename field isn't populated with "Weekly Gift Report 2026.02.16 - 2026.02.22.xlsm" like I feel like it should be. Any idea why??