I have OpenProject 8.2.0 installed on latest Debian Stable. I installed it via the binary packages and I also set up nginx as web server for it. Passenger is running properly and openproject runs with no major issue but one thing is driving me crazy is that I cannot upload attachments. At 1st according to the Production log it was a matter of permission, which I changed and everything worked well for a while. Now the problem is intermitent and come and goes. I as a 1st measure increased the attachment size on nginx and also increased the attachment size on openproject system settings via the gui. But the problem still persist. I created several dummy files on different sizes to do some testing but all I get is (See Attachment). I am only able to upload small txt files even I have increased the attachment size on nginx 

Thanks