Not working for multiple topics in a single bag file

[AnlageM]

Ros Noetic, Ubuntu 20.04.
It seems it is working, after porting the "print" instructions to Python 3 by adding parentheses.

I tried to write the command as suggested in the readme:
python rosbag_remote_record.py -m ros -i /my_first_topic /my/second/topic /mythird/topic -f testfile
and it just records the first topic I list.

Am I using it wrong?
Thank you!

Yes I was.
I worked this way:
python rosbag_remote_record.py -m ros -i "/my_first_topic /my/second/topic /mythird/topic" -f testfile