Its a pain but here's how I've been able to do it.
Settings
Manage Files
Choose File
Upload
After picture is uploaded , click the blue hyperlink
The attached file (picture) should open in a new window
Copy the url
Click the Insert Image button
Copy and Paste URL
Done
Digital music is much more then MP3's and lets just talk about CD's because we are talking about music in cars. Best buy will not be selling CD's as of this summer. Digital sales has passed physical media sales since the 1st half of 2017. I would venture to say that Records are out selling CD's...
Brake squeal is usually caused by the pads being glazed. This could be caused be riding your brakes or sticky calipers. Taking the pads out roughing them up and putting a 45 edge all around will get rid of the squeal.
Not vents but speaker grills for the 10 speaker Bose system.
Do you have a part number and manufacturer of the stock speakers from the doors now that you have them out? I'm asking to see if I can get the spec's from them.
I have a 2018 and this has happened once in sunny southern California with a clean windshield to mine. So I'd say 2018's are not exempt from this problem.
I use USB sticks and yes some of the album art is a picture of the band instead of the album cover. I'm assuming this is what you're talking about. Why it does this I have no idea. My thinking is that for whatever reason Gracenote is not recognizing the tag for the album but it knows the Artist...
I can mute mine when using USB. Then when I start it up again it's still on mute. I use the control noob to mute it but I do agree that there should be a way to just turn it off and on if needed.
My 18 did it once. It was a sunny day, windshield was clean. I didn't notice all the other stuff like you did but when I stopped the car and got back in a few minutes later it was back to normal. Hasn't done it since.