Why there is not Spectrum view after mosaic sentinel 2 images in SNAP

I am working on 3 sheets of sentinel 2 images. After mosaic the sheets in SNAP by multi size mosaic, there is not the spectrum view for the new file. Is it related to Metadata file that is not transferred from the original images?

Another issue, Which one done firstly, the atmospheric correction or mosaicing?

That’s a known issue. https://senbox.atlassian.net/browse/SNAP-745
You can add the wavelength afterwards.
Right-click on the band and select properties. There you can specify the wavelength

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Hi Marpet,
Thanks for replying, I add the wavelength and the problem was solved.
Kind regards,