Yes. Dividends are attached to the holdings that earned them, with the gross amount, the tax withheld at source and the net that reached you, and they appear without being typed in.
Share splits are picked up on the instrument, so an old trade keeps the quantity and the cost that make today's position correct.
Anything the product cannot see, such as a payment from an unlisted holding, can be entered by hand and behaves the same afterwards.
See the dividend tracking