My suggestion is to contact their support team, unless you are willing to experiment yourself with real coins.
Are they offering active support somewhere? They have different social media channels like reddit, Discord, and GitHub. That's probably the best way. Their Telegram channel is only for announcements - no support there. I don't remember if there was a live chat option back when I tested the wallet briefly. Another option is to get in touch with the Horizontal Systems team.
Now for the latest update, you can use the Tron Network in Unstoppable Wallet.
It is already fully Integrated
Too bad that they forgot the most important part - swaps between Tron and Tron-based tokens and other cryptocurrencies. It's questionable whether or not it will be added in the future.