Usage of に in this sentence **** Asuka _gathered(?) many (photographs) of Mare via his camera_ ?? Aside from the odd use of , why did they use over in this sentence? Thank you

I think this may be similar to how in English we can say we "caught" something in our camera. The idea being that the film is in the camera and film captures the image. In this case, makes sense as the location of where the image is (as opposed to how the image was captured).

There is an on-line thesaurus for which a web search of shows up.
And this web site explains as follows:

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