I downloaded separated bands, and afterwards I created an RGB map, (by firstly aggregating all of them into one of them using Math Bands). And the product will look like this:
When I close SNAP and re open it, I have to do this band math all over again, because my first product, didn’t kept all the bands inside… It will look like this, even if I saved the session:
This is because the jp2-format does not support virtual bands. You would have to save it in DIMAP format first. If you want the bands permanently in the product you can:
Right click > Convert band and then save the whole product OR
You can also disable the the virtual option when using the Band Maths.
This creates real bands with the reference to the other products. But still you have to save the product e.g. to BEAM-Dimap, NetCDF or GeoTIFF.
Oh! thank you also @marpet, yes, I was creating virtual bands the whole time.
But when I try to right click on the product and select Save Product As… nothing happens.
(I was expecting so see different formats to choose.)