First, a disclaimer.. I have never used SharePoint. Don't know anything about it.
I will be referencing these two sites: AcSpreadSheetType and DoCmd.TransferSpreadsheet
I see three things that concern me.
The Syntax is
DoCmd.TransferSpreadsheet(TransferType, SpreadsheetType, TableName, FileName, HasFieldNames, Range, UseOA)
1)
For the SpreadsheetType parameter, I would use acSpreadsheetTypeExcel12Xml (see the AcSpreadSheetType link)
2)
And the path doesn't look right. Using today's date, 11/18/2021, the path & filename would be
"\\localserver20211118 Summary & Movement Report.xlsb"
Shouldn't there be a back slash after "localserver"?
I would expect the path to look something like
\\PC980\Users\Bozo\Downloads\lnt2_el4_el7b_el3_el7 .pdf
Can you use the File Explorer to navigate to the location you want the file to be saved and get the actual path?
3)
You have "data" for the Range parameter. According to the DoCmd.TransferSpreadsheet link, this is only valid for importing.
Good luck with your project....
HTH
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Steve
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"Veni, Vidi, Velcro"
(I came; I saw; I stuck around.)