When I go to upload a webp image, it shows me a grey screen instead of inserting the image.
Reproduction steps
1. Download a webp image Redit Example 
2. Create a new section with the [+]
3. Drag your image into the new section
What happens? The new section gets smaller but still shows the same text.
What do I expect to happen? The image to show in a preview and a caption text to show. If this can't happen, I expect an error.