Hi Serhankalay, I think the issue could be due to incorrect file headers or MIME types being sent by the server. Make sure the server is correctly configured to send the appropriate MIME types for Excel and PDF files to ensure proper interpretation by the browser. Furthermore, check if there are any server-side scripts or configurations altering the file types during the download process.

This could happen due to conflicting package names or storage limitations. Probably you are using the free version.