Solve : No Customize on some folders.?

1.	Solve : No Customize on some folders.?
Answer» I am using Windows XP SP3 for this issue. I also use Windows 7 and Windows 10 on the computer. I am not sure when this PROBLEM began. It seems to be very recent. Last week I could PUT image in the folder THUMBNAIL. Now I can not. But the folder next to it has the customize option. This has me baffled. SEE attachment below. In fact many thumbnails are missing. How did this happen?

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