When I upload the first image by clicking "Select image or paste it from the clipboard", the spinning sign should go away after the image is uploaded and the markdown is inserted into the editor. Then the text should change back to "Select image or paste it from the clipboard.". User should be able to click the text again and upload another image.
After the first image is uploaded, the spinning sign is still there and the text is "Uploading your image..." You can still click on the text to upload another image, but it's not user friendly.
How to reproduce
I am on MacOS 10.13.1, Google Chrome. If you start a new bug hunting and upload your first image into the editor. It will happen.
Recording Of The Bug
Posted on Utopian.io - Rewarding Open Source Contributors