How to reproduce:

• Create a content
• In the rich-text, try to insert a video
• Chose a .jpg file (or another file that is not a video)
• An error occurs because this type of file is not supported => OK
• Select a video file, but one that will lead to an error (a too big file for example)
• Click on the ok button
• An error occurs => OK
• Select your first file again
• There is no error and you can click on ok button => KO