error when transfering photos from phone to iMAC

Hi coachcp,

Since you're trying to move photos from your Samsung device to your Mac, we recommend that you try the steps here: Import photos from a camera or phone using Photos on Mac - Apple Support

To perform the recommended troubleshooting steps via the link above, complete the steps in the section titled "Import from a third-party mobile phone or device."

If you use a third-party phone or other mobile device, you may be able to connect the device to your computer using a USB cable, then copy photos from the phone into Photos just as you would from an external storage device.

Note: Some third-party phones may connect to a computer using a Bluetooth (wireless) connection. Use the Bluetooth File Exchange app to import photos via Bluetooth. 

1. Connect the phone to your computer. 

2. Drag the photos onto your computer’s internal disk.

3. Do one of the following: 

4. Note: If you participate in an iCloud Shared Photo Library, choose Your Library or Shared Library from the Add To pop-up menu. 

* Drag files or folders from the Finder to the Photos window.

* Drag files or folders from the Finder to the Photos icon in the Dock.

* In Photos, choose File > Import. Select the photos or folder that you want to import, then click Review for Import. If you selected multiple photos or videos, select the photos or video that you want to import, then click Import [number] Selected or Import All.

* Important: Don’t eject a camera or device while the photos or videos are being imported.

We recommend the steps above because they will show you how to import photos from your phone using your Mac.

Please let us know the outcome after giving the above steps a try.

Thanks for using the Apple Support Communities.

Cheers!

You're welcome coachcp,

We're glad we could help! Feel free to reach back out if you experience any other technical issue with an Apple device or service!

All the best!