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Hello API Team,

I have a question regarding document/file upload via API. I have uploaded a large number of documents via API and most of them were successful but xls/xlsx files seem to be corrupted after download them back from Maximzier.

During the upload all went fine, no error messaged, no corruptions, the file name, description was created without any error. I can also download the document manually and that works as well but when I try to open the document I am getting error: "Excel cannot be open the file 'filename.xlsx' because the file format or file extension is not valid"
Other files like doc/docx, pdf documents are absolutely fine just xlsx/xls are causing issue.
Is there any particular way to upload this type of file? or is there anything in particular to watch out for when attempting to upload the xls/xlsx files via API?

Thank you