Describe the bug
When I am using the Gutenberg page editor and try to upload an image, it will not load. I get an error message.

To Reproduce
Here's a screencast video of the problem:

Unable to display content. Adobe Flash is required.

https://www.screencast.com/t/B32tdZSN

Expected behavior
I would expect wordpress to upload the file and show me my other files that have already been uploaded to my Media Library (they are not visible when I open the library, but I can see them on my web pages)

Screenshots

Desktop (please complete the following information):

• OS: Windows
• Browser: Chrome
• Version: Version 68.0.3440.106 (Official Build) (64-bit)