Applying the Reverb

Hello everyone!

I’m processing an audio file that I captured on my cell phone recording a video playing my Saxophone. I notice that when I add Reverb to some parts of the file where the amplitude (volume) is a little low, the reverb is not applied. Could you guide me if there is any configuration to fix this or it could be a problem with my system/computer. I use Windows 10 and Audacity version 3.0.2.

Thank you very much!