There is no error message.
But I captured some screenshots.
1. Select menu 'image gallery'
2. Upload image file
3. Upload success but doen't show
This is screenshot of exploroer in server.
4. The file uploaded can't be read in server. File size is not different with original file.
5. Renamed file uploaded by FTP can be read.
Do you have any suggestion? It's very important to me.