Let's compare to the 1st in a like-for-like, then. You scream "Let's go Brandon". The government doesn't stop you. A lawman then asks whether you shouted it or not, and you confirm you did. No harm comes to you.
Oooooh, truly oppressive.
In your example, the cop is not making a conviction of me for a crime more or less likely. It's immaterial. The Prosecution, on the other hand, metaphorically speaking, winked to the jury saying, "hey, y'know he kept silent. He must be guilty! Please convict him." I'll try to look up some case law to show you this is forbidden conduct for which the prosecutor should have his card suspended at a minimum.
It's not "benefit of the doubt" to require actual evidence of misconduct. Changing a filename is not that at all; it's completely meaningless as to the content of the video.
You have absolutely no compelling reason, not one iota of one, to assume the content was changed. It wasn't. You're blaming the prosecution for literally doing what the defence asked them to, and it's absurd.
The file name change suggests the opposite of what you'd posited earlier.
They did not simply take the file and email it to the defense and whatever service they used changed the name, compressed the file into something un-viewable as well as its format. That didn't happen. And if it didn't happen, what really did? Especially with HandBrake software on their computer? Without giving the Prosecution the benefit of the doubt, one must acknowledge that it is possible some "smart" guy looked at the request, could have emailed the Defense a link to a Dropbox but instead thought to himself, "y'know, given the wording of their request, I think I can get away converting the video into something that is virtually un-viewable, and they won't be able to prepare a response regarding it. And only after the trial, one Prosecutor dropped the ball and said they had a much better, clearer copy to review.
EDIT:
So far, " Once a person has been
read their Miranda rights or is taken into custody by police or other law enforcement officers, the prosecutor cannot introduce evidence of a defendant’s silence, and a jury
cannot use it to infer guilt. "
https://www.justcriminallaw.com/criminal-charges-questions/2021/04/29/admission-by-silence/