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If wetmaps are not displayed or created correctly it is very likely that the UV grid of your (external) object is either not unwrapped or wrong. Some plugins also do not allow the use of a texture tag while exporting the object(s). In other words textures have to be removed before the object is exported.
Load Texture
If you want to apply a texture map then you are able to load an appropriate file with this dialogue. When you reopen a scene with textured nodes, RealFlow will search for image maps in the applied folders and directories. If the assigned map cannot be be found you will see a default UV texture.
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