I am working on contact form 7. The problem is whenever I tried to upload .docx file; form was not submitted. But the wheel was spinning infinitely. in inspect mode, I find the response for form was 502 bad gateway error.
But, If I try to upload .doc, .pdf file; all is working good. Please help me whether it is a bug in contact form 7 or is there any solution is available to resolve.
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