Not previewing pics or pdf

Hi, i’m having an issue on the gallery view…
I uploaded a pdf document on one my tabs…When i click on it, it got a broken image icon…
If i click on it i get an error "We’re sorry, the preview didn’t load… This document may be protected… However document is not protected…If i download it from the options, i can open and view perfectly…
This problem only started this morning…

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I have the same issue that image cannot preview just now…
Please help to solve…thanks