When I tried to upload images, all of them have "?" thumbnail. I am not sure why and how to fix it? Thank you,
Did you create your own WordPress instance, or are you using the Vultr one-click WordPress app?
Hello, I am using Vultr one-click Wordpress app. I managed to solve the problem by changing the permission folder and the files to 755.
Thank you for clarifying. We will attempt to reproduce this issue internally.