Qfile cannot preview photo

Using TS-251, iOS file recently cannot preview new upload photo, but can view old files.
Try reboot NAS but no help. What to do to fix it, thanks Ching

部NAS Gen好縮圖未?未gen縮圖就會冇野睇

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Gen好, 可以睇到縮圖

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anyone know the answers ? thanks

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