First thought - In Windows Explorer go Tools>Folder Options>View Tab and under the Advanced Settings scroll down to the last item "Enable simple file sharing (Recommended) It should be ticked.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.