Ok, this has just happened recently from what I can tell (had been working fine). When you are on mobile and go to add an image/video/gif etc to a forum post, the options are black on black at the bottom of the screen, so it looks like it's just a blank screen. You can still touch the bottom left of the screen to add a photo but you can't see it's there. See the screenshots below - first image is where you write your comment, then when I click the plus sign to add an image/file etc you get the second screen.
How can I fix this? I can't see anywhere in the editor to adjust this setting.
It works fine while on computer, this is only an issue on mobile. Also weirdly the add post/finish icon is off screen so you have to scroll sideways to find it, but the black on black issue is much more important.