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Hi Preecha
I'm AnnaThomas and I'd happily help you with your question. In this Forum, we are Microsoft consumers just like yourself.
Note: File upload is only available when Only people in my organization can respond or Specific people in my organization can respond is the selected setting. That would be the reason this is not showing.
Learn more: https://support.microsoft.com/office/6a75a658-c02b-450e-b119-d068f3cba4cf
I hope this helps ;-), let me know if this is contrary to what you need, I would still be helpful to answer more of your questions.
Best Regards,
AnnaThomas
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