One idea would be to scan one or multiple folders for duplicates. This would be helpful in saving unnecessary storage space. Another interesting option would be to add only new photos during the backup process.
Thanks for the idea for CopyTrans Studio. Now the program supports adding photos to the Camra Roll.
If you want to transfer photos from Pc to "Frim my Mac" folder, please use CopyTrans Photo: https://www.copytrans.net/copytransphoto/
The function is supported there.