Audio Waveform Not Showing Without Processing
Recently, the audio waveform was not showing in my recording timeline. I'm a long-time screenflow user, and the audio waveform was always visible. I found that when I checked the "Processing - smooth volume levels" checkbox, the audio waveform appeared. Up until recently (on my IMac running Big Sur), the audio waveform appeared without having to check the processing checkbox. I don't know what caused this, but thought others may find this info useful.
See the before and after images.
I'm not sure what you mean. In both images (before/after) the waveform is showing. Obviously in the "before" version it's a lot lower but it's definitely there.
I'm guessing you may need new glasses :) or perhaps you uploaded the wrong "before" image. At any rate all looks fine to me. It does look like your microphone (whatever it is) is recording at a pretty low level. I don't know if you are using the Mac's mic or something else. But low isn't necessarily bad as long as the audio input is clean.