Edit: My comment is irrelevant to this post because I cannot read, apparently. Haha
I guess there is no better alternative, but I don’t really think this is ideal. Spectograms are evidence. The reason for them not being allowed on iNat is this:
Personally, I disagree with spectrograms being handled differently from other “grey area” photos (such as tracks), but if staff have said that that’s the way it should be, then I don’t want to argue about it.