- Upload an image as part of a post or comment
- Navigate to your profile page -> Uploads
- Open image in new tab (and save the URL)
- Press “delete” on the image
- Attempt to navigate to the saved URL
This should result in a 404 error. Currently, it shows the screenshot. Below is a screenshot I deleted from my profile:
Here is confirmation from my user profile taken after the above screenshot was deleted:
Generally you should assume that deletion is not guaranteed when it comes to fediverse stuff. In this case it seems like a bug, but other instances might also be configured to just refuse deletion requests so you can never be sure anything is gone. This also applies to the internet in general tho.