Hello,
Let's determine the cause of the issue. To get started, we'd like to get the following information:
- Is this your first time to encounter this issue?
- Does the issue persist with all the files coming from the messenger?
- Did you make any changes to your computer's configuration prior to the issue?
To copy files from Windows 8 laptop to Windows 10 Phone, connect your phone to your computer and it will show up a device in Windows Explorer. You can simply drag and drop files in Windows Explorer to copy them to the device.
Looking forward to your response.