Can I generate a spectrogram when a waveform already exists?

[kanasc]

I started this particular subtitling project before discovering the "Generate spectrogram" checkbox in Settings, so the video I'm working with has an associated waveform but no spectrogram. I find the spectrogram a very helpful addition to the waveform in finding where speech begins and ends (especially when there's music playing as well), so I'd like to have both like in my more recent projects, but I can't see a way to generate a spectrogram once the waveform already exists (or even re-generate the waveform).

Am I missing something? I don't really want to empty everything in the waveform and spectrogram folders, since I have multiple projects on the go and I can't tell which file is associated with which video, but if that's the only way then I can do that, as long as my shot change data would remain intact (I think that's in a separate folder so I'm assuming it would).

Thank you!

[kanasc]

I found I could just put the same video file through Video -> Batch Generate Waveforms and that added the spectrogram!