Comment by TZubiri

If your boss tells you explicitly that this is ok, then go ahead. And also if they don't tell you this, it might be ok too. But there's scenarios were you are being paid to do a very specific job, and trying to get promoted is a form of escapism for many and it can be an organizational problem.

In argentina we have a saying "Too much chief for too few indians"(as in indigenous people), everyone wants to be the boss, no one wants to do the dishes.

I've been a victim of this, and it especially was a problem when my actual role responsibilities suffered, but even if I managed to fulfill my responsibilities perfectly, it caused friction and a command chain confusion. (especially when other people tried to compete for a promotion as well)