I have The Sims 3, Pets, and Late Night installed. I've tried many different times with multiple tattoos, but they never show up in my game. I have all the default ones still but none that I've downloaded. I'm pretty positive that I'm installing them correctly also so I'm not sure what else to try.
You downloaded them from the exchange to your launcher and then installed them to your game ?
Have you tried installing something other than a tattoo to see if that works ?
There are some tattoos that are pre-ambitions that aren't' found in the tattoo section but are makeup or accessory but if you downloaded them from the tattoo section of the Exchange, they should be real tattoos.
Maybe there's a problem with the tattoos. The exchange is not a very bug-free zone. There are many issues with it.
Maybe someone else can help you or has a similar problem.
Do you have a link for me of one that works and one that doesn't.
I'll try myself.
I couldn't find a link to any that worked but here are some that didnt:
http://www.thesims3.com/assetDetail.html?assetId=4407092#
http://www.thesims3.com/assetDetail.html?assetId=4621459
http://www.thesims3.com/assetDetail.html?assetId=4745494
http://www.thesims3.com/assetDetail.html?assetId=4817923
Pretty much any tattoo I've downloaded from the exchange won't work.
I've tried the first one and it works in my game ☹️
Where are you looking ? The tattoo part ? Did you try showing only custom content for the tatoo ?
