Only one output for each process

[keooek]

Executing:

progress -p pidof firefox

[ 3851] firefox /usr/lib/firefox/browser/omni.ja 0.0% (0 / 32.2 MiB)

Get only one output file when it is downloading several files. Also tried to monitor with process id of a filebeat reading 30 files and only shows one entry.

It is the normal behavior or is a bug? Multiple lines will be great to monitor filebeat.

Thanks in advance.