I was trying to upload files to a File List, .XLSX files were uploaded without problem, however, whenever I try to upload .PDF files, it always failed.
Error message: Invalid response received from the server.
I've tried to reproduce this on Confluence 6.9 and in Confluence Cloud with several different PDF files but I wasn't able to see the error that you got in your instance. I was able to upload the files without any issues and display them afterward. Can you please provide additional information?
What is your Confluence platform/version and what is the size of the files you are trying to upload?
Hi Alex, you may also want to check if the problem has anything to do with the size limits the instance administrator may have configured for attachment uploads.
Also, if this is a Server instance, the admin would be able to see what other messages are logged in the log file when you try to upload the PDF.
If behind an NGINX proxy server
In the configuration file in /etc/nginx/sites-enabled directory for the appropriate config file in the server section, add or update the client_max_body_size directive using an appropriate maximum size such as 100M to limit uploads to a maximum size of 100 Megabytes. The default when not explicitly specified is 1M
listen 443 ssl;
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