Error when downloading file from website with webviewer kodular

Salam,
I have a problem, when finished make a webviewer application and used it to download a file from my website, suddenly the file format has been changed, the name of file change to “Download” and without extension.
So, at the last that file cannot opened.
Anybody can help to gave me problem solving for my case ?
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error-2

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please help, i had same trouble… the file i downloaded but file wont open

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