How to restore shiny-server and tmp folders permissions for input$file to work properly?

I have apps to upload files that work well locally but are falling when deployed in the shiny-server installed at my organization. The input widgets are showing me the following error:


I see no informative messages in my log files. I guess it has something to do with file permissions. For adummyApp folder and my tmp folder (as shown by ls -l command) the information is:

drwxrwsrwx  3  administrador2 shiny        4096 Jan  4 17:18 testApp

drwxrwxrwt  19 root           root        12288 Jan  4 16:01 tmp

Is there something I might have done to mess the default working setting?

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