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I was having some issues getting uploads working on symfony4, i've ended up discovering an issue that might affect certain versions of nginx over alpine.
dockerfile/nginx#4
https://wincent.com/wiki/Fixing_nginx_client_body_temp_permission_denied_errors
Adding these fixes for nginx, (set a writable tmp dir config), and also installing php7-fileinfo (symfony requirement) fixed completely my issues regarding file uploads in symfony4.
What do you guys think?