Tried to upload an image with extension .jpeg, not .jpg

I used the ‘upload image’ button in the ‘body’ part of the posting page

What’s the URL option on top? I don’t understand why that’s there

There’s an ‘image’ option next, and that won’t let me upload either

Same error both times

And then I have to choose a community, and I’m not always sure where I came from. I’m so confused.

Anyway, can’t upload images here