Uploaded file does not have an allowed extension.

I searched and found no results. Each time I try to upload a file to sell in the marketplace I get this error. I tried to upload a .zip file as well and still get the same msg. Did I miss something? These Thanks for any help.

The following error occurred
The uploaded file does not have an allowed extension.

downnload.pdf

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The following error occurred
The uploaded file does not have an allowed extension.

downnload.zip

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