I have done the plug in, check permissions (upload folder which contains files for the media contents is 755), clearing cache (there was none, apparently), disable any extra plug-ins, check and uncheck things, nothing. I did upload everything thru wordpress.
I checked bluehost server status, and it is up. even for my particular username. On my phone, if i go to media (on wordpress app) the images are grey and no preview. If i click on them, it says "There was a problem loading the media item." yes, i refreshed.
My header slider image won't appear on the website (even in the customize on the side), and when I click to change photo, the media library is all gray boxes again.