Issue with the file upload if the size exceed 28.5MB

I am in appian 17.1. I have created test pdf file using powershell.

When I upload file size <= 28.4MB, Appian uploaded the file successfully

But when I upload file size >29MP, Appian trying to upload the file (ie i can see the progress bar) but actually is not uploading the file and not giving any error message as well.

Any suggestion?

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