Thanks Adem.
I've shared those reproduction steps with our engineering team so they can see whether this issue might already fall under the scope of ongoing improvements, and if not we'll investigate this accordingly. If they require anything else, I will let you know.
As for the corrupted videos, I haven't encountered an issue like this before with media that can't be deleted. Are you able to share a copy of your Twinmotion file with the video clips in question? If so, please submit a bug report referncing this discussion post with the file for the support team to investigate. When sending your file, be sure to use the Resource Collector in the Edit menu of Twinmotion to package all your project's contents.
Best,
Raghib