All media suddenly dissapeared. Oneplus 5

Hi there.
I have a Oneplus 5 running Android 8.1.
Today I connected this to my Windows PC via usb cable to copy over my pictures. After I deleted a file which I believed to be called thumbdata. or similar from my pictures folder (on the phone in the android file structure) suddenly and instantly all kinds of media is missing of my phone.
The folder Pictures, Movies, Music, Downloads, DCIM and probably some other have completely disappeared. The folder Whatsapp is still there but all...

All media suddenly dissapeared. Oneplus 5

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