The waveform is too flat to edit
If your mic recorded on a low setting, or for example, native on an iPhone, your audio waveform may be too difficult to see between cuts.
If it's too hard to see the waveform to edit:
To fix this,
Click on Settings in the top-left corner, turn on Audio Normalization, Noise Reduction and Volume Increase and Restart App.
Once you load your file again in TimeBolt, it should look this this.
Warning: The audio preview will sound different, but this is only limited to Preview Mode. The exported output will not be affected.