LANP environment, with rich text editor to upload images to a directory, images will be inexplicably deleted?

LANP environment, with rich text editor to upload images to a directory, images will be inexplicably deleted?
is not a code problem, nor is the editor problem, I changed 2 kinds of editors are like this, Baidu editor and
Kindeditor, it will be deleted in about 20 minutes, the PHP code is determined not to delete the file operation,
Directory permissions are 775, as for logs, PHP error logs and Nginx access logs I didn't even look.

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LANP environment, with rich text editor to upload images to a directory, images will be inexplicably deleted?
is not a code problem, nor is the editor problem, I changed 2 kinds of editors are like this, Baidu editor and
Kindeditor, it will be deleted in about 20 minutes, the PHP code is determined not to delete the file operation,
Directory permissions are 775, as for logs, PHP error logs and Nginx access logs I didn't even look.

What editor? What are the permissions for the directory? Is there any display in the related log? How long after it was deleted?
The problem is not detailed enough ...

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