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Raster layers do **not** appear in the postgis browser side bar. You need to look for them in the data base manager. The capability to store raster data within a postgis data base was developed much later than the functionality with vector data. Although it is useful to be able to store and process rasters within postgis it is more difficult to use a database for raster work and a database arguably offers rather fewer advantages. So there is still less emphasis placed on this aspect of Postgis. Geoservers and mapservers are still more conventional tools for sharing rasters online.
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