After looking at the information of mobile hard disk, you can see that it is NTFS partition format on Windows system.

When using NTFS to open the mobile hard disk on Mac, there is no option to "paste" the writing by clicking the right mouse button. Even if you want to drag files directly on the Mac, you can't.

There are many third-party softwares on the Internet that allow Mac to write data to the hard disk of NTFS partition. Here, Mounty software for personal use can be downloaded for free through Baidu search.

After installing Mounty software on Mac and opening it, if the mobile hard disk is currently connected, a prompt message will pop up asking whether to reload the current mobile hard disk in "read-write" mode. Click Yes, of course! Do it.

Next, Mounty software will reload the hard disk and automatically open the hard disk. Click the right mouse button to see the option of "New Folder", which means that data can be written to the mobile hard disk at present.

Here, try to drag a picture from the Mac to the mobile hard disk, and you can see that it has been written to the hard disk normally.