Smoke flow

I did everything like on the tutorial on youtube, even tweaked my own settings and nothing works, particles don’t follow the smoke and are late after the smoke.

Screen capture shows that the flow source is the mesh ( the circle).
To use particle system emitted from the circle as the flow source, you have to change Mesh to Particle System.
The tutorial that you saw is probably older than the ability to emit smoke from mesh geometry.
At this period, particle system was the default.

I fixed it, it was not a mesh problem. Somewhat the face of that circle disappeared but still it was emitting particles, it was about the “power” of smoke flow, had to set it to 0.100 to work.