In case someone doesn't know how to make a "keep reading" on mobile:
I've seen some nerve-racking 10k fics that don't have the cut and in their worst, they're also full of media like "this is a picture of what you're wearing, this is the view you're seeing from your hotel room, here's a gif how x looks at you in this scene" = Tumblr app struggles to load that wall of text and media and then Tumblr app crashes and when asked to put the cut, people are like "I'm on mobile and can't put the cut" so here's a little tutorial video for you guys.
I know this is a problem with all characters but tagging some popular ones to gain exposure for this post.