This is also my recent experience: come prepared.
In a recent trip to Martinique, from Montreal, had fifteen 120 rolls and six 35mm rolls in two zip-lock bags with Kodak "Do not X-ray" stickers on them, and showed them to the person in charge even before I put my other stuff in the tray. Had no problems getting a hand check both in Montreal and in Fort-de-France (helped that I got to the latter very early).
Sticker makes it look like you're a pro going on an assignment. Say what you will about the company, but the Kodak colours are still well recognized and do impress people
I had forgotten to take the stickers on my last trip, but no issues. However, Rome Fiumicino do have very loudly "no film safe" signage on the tray area. What I didn't expect was that I was directed to just a single line on one side that handles film; it was not had checked but scanned in a small traditional machine. Thankfully it was a very quiet day, it'd be annoying to have to switch lines across half of the security area although I was guided and passed by the agents so perhaps there would be no more difference.
Usually I just notify the agent and all goes smooth. In Europe some of the airports do have a 35mm canister icon crossed over it as no show not film safe.
As of the stickers, I actually just print out on ordinary paper and tape them to the bag. On my Asian trip a couple years ago, I was going through customs and given the rushed line I just chucked all the film into the scanner. It was a traditional scanner and the parallel CT line was off.
Rather amusing that the agents were intrigued by the mass shown in the screen by 70+ 120 rolls so I was manually screened anyways. One of the agents was concerned and took the sticker very seriously hoping they didn't damage anything.
Film was all good. And "oh real old school photography".
On the outbound trip I was granted a handcheck despite it being ordinary machines and the agent asked if I was a pro. I did reflect that it was a big trip and took my hobby quite seriously.
For unexposed 120 rolls I do not remove the wrapper, as it's factory sealed anyways. Never had an issue. As I tend to have leftover film and the places I have been are hot and humid, might be good to keep it with the wrapper. Sadly, somehow, one of my 35mm unexposed rolls was humidity damaged during my last Asian journey! Interestingly only that one and it was in the same ziplocks as other 35mm and 120 rolls.