Seems the site doesn't like webp images. Looking into that. Also if you have any problem with jpgs or pngs try adding them as an attachment to your post and clicking insert on the attachment.
Here are a couple of things I've seen worth mentioning while poking around this morning. I don't know whether we should start a new thread for each report or turn this one into a running thread where everything is aggregated, but these seem like easy changes so I'm just adding them here.
1. The notification badges that appear on the bell icon are red, which are visible but can be easy to miss with the darker red background. I haven't seen a notification come across on PC yet, but they didn't really stand out on mobile. I wonder if the darker red here can be edited separately from the rest.
Edit: I was wrong, the red on mobile is brighter. Here’s how they appear on both.
2. When you click to select text that you're typing, the highlight color on PC (Firefox) is black and so is the text itself. iOS seems to use the system's default blue highlight so no issues there.
3. Now that I'm typing this, I'm not sure that bulleted or numbered lists are enabled.
Hadn't thought about the bell icon, good catch. I'm working on the highlight color, and yeah the bulleted lists are currently disabled, I think. I'll look at enabling.