When the user uploads a thumbnail image, the workflows currently will not process this image but rather pass it trough. This has several disadvantages:
The user might upload an image that can be processed by ffmpeg but cannot be displayed in a web page
The user might upload very large images which cause long loading times
Steps to reproduce:
1. Upload a thumbnail image that a browser is not able to display in a web page in the video editor
2. Run the workflow "Update previews"
3. Open the video editor and go to the tab "Thumbnail"
The Thumbnail image cannot be displayed
The thumbnail image should be displayed
Workaround (if any):