Sending a whole bank statement when someone asked for one page hands over far more than you meant to. Taking the page out first is safer and quicker.
It is tempting to screenshot the page instead. Resist it. A screenshot loses the selectable text, prints badly, and looks like a screenshot to whoever receives it.
Extracting keeps the real page: same text, same quality, same size on paper. What comes out is a proper PDF, just shorter.
Because the split happens in your browser, the rest of the document was never sent anywhere either, which is usually the whole point of sending one page.
It is ignored rather than failing, and the count tells you how many pages you are actually keeping.
Use the rotate and reorder tool for that. It shows every page as a thumbnail.
No.