by clicking on the bottom.
by clicking the bottom.
It seems to me that the first sentence ‘by clicking on the bottom’, the person is clicking contents that comes after the current content and the area of the content is vague and not specified at least to me.
The 2nd sentence sounds to me as if the person. Is directly clicking the next content right below the current content, and the content only?
What difference does the preposition ‘on’ make here? any idea?