@sophia111 ,
So the thing is , you are launching the excel and save but not closing before that you are trying to open,
try to complete all action and try.
2nd instead of save as use close excel inside properties.
Refer image:

If you want to kill excel use this code:
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Regards,
Riyaz
Scripting.RunDOSCommand.RunDOSCommand DOSCommandOrApplication: $'''taskkill /f /im excel.exe'''