Missing product images

[arctanh]

I have installed Magento 2.0.2, I always end up with the same problem: I cannot upload images.

The image placeholders are there, but the image is not visible. Happens both in frontend and backend,

I uploaded 6 images for 2 products, they kinda seem to have uploaded to the server (3 of them are on /media/catalog/product/o/d, the other 3 are in one part of the thumbnail cache folder....)

What can I do to fix this?

[Dmitry_Fedyuk]

Please ensure your filesystem permissions are proper: http://devdocs.magento.com/guides/v2.0/install-gde/prereq/file-system-perms.html