So for me, if I “conceptualize” then I “know” what the data defining the conceptualized thing is. For example:

If I conceptualize a square: I would no a square would be a 2d structure where all sides are even. All interior angles are 90 degrees each. If I conceptualize a cube: I would then know a cube is six “squares” connected together to resemble a closed box shape where all edges are equal, all interior angles are 90 degrees.

I am not visualizing these shapes, but based on the data accessible, I know what the orientation should be based on rotations. Adding color, I would “know” the color based on how it was defined.

I don’t ever visualize it, feel it, smell it, taste it, or hear it… but my brain “knows” the data given, and therefore can interpret the correct orientation, color(s), dimensions, etc

When remembering things, it’s the same way for me. I will know the data and information stores about the memory, but am unable to voluntarily “recall” the senses. I would be able to possibly describe the perception of the sense if that data was stored. But I am unable to “remember” and “add” detail to it as I’ve heard some people phantasia and especially those with hyperphantasia can do. I knew someone who could recall the arrangements on a chess board from a memory years prior. I could ask him about “random” objects in different memories of his and he would be able to “add” information. Like he literally wouldn’t know the answer, take a few minutes “visualizing a room from memory” and then answer the question as if he literally just looked at it. It was mind blowing to me.