I was able to fix the images already installed (using a combo of changing some media settings & using Force Regenerate Thumbnails) but I cannot add any “new’ media files to any posts, pages or widgets.
I have done a fresh install of WordPress, checked permissions (all good), deactivated all plugins and checked (still have issue) any recommendations? Thanks
Indeed, the issue is not related to the theme, actually ;)
In most cases like this the issue arises after making some changes to your website or server, or even after updates. In that case I suggest checking those actions first. You can also check your PHP settings, just to be sure.
I’m glad you were able to resolve the issue!