Will the image files of the old mobile phone (Huawei) be retained after being transferred to the new mobile phone (realme) with its own transmission software?

When you copy or paste a picture file from an old mobile phone through the transmission software of a new mobile phone, it is a process of uploading from one client to another. But there will still be some data in the memory of the old mobile phone. So I suggest that you restore the old mobile phone to the factory settings before emptying everything in the memory card. Including all the garbage in the memory trash can. So there is nothing in your old mobile phone. You can also consult professional and technical personnel.