Image uploading test & lock conversation test

[noraworld]

[noraworld]

I've noticed that I can still leave a comment because I'm the owner of this repository.

[noraworld]

Foo

[noraworld]

The images outside of GitHub can be shown and saved.

[noraworld]

GitHub tries to save the images even before the comment is uploaded. The image below had been saved before the comment above was uploaded.

[noraworld]

Uploaded via this issue.

[noraworld]

[noraworld]

Bar