Softorino Youtube Converter is developed for a specific purpose of downloading Youtube videos & audio to watch them or listen offline on your iPhone, iPad, iPod Touch or your Mac computer.
We’re confident that the key feature is the ability to convert any youtube video directly into your iPhone, iPad or iPad Touch without having to use iTunes. This is the first ever app to do this.
All imported media goes straight into your default apps that are developed by Apple.
Softorino Youtube Converter license costs $19.95 for a lifetime license! But there's an option to continue using it in trial mode when you first launch the app. And it doesn’t cost a dime to download Youtube videos to your Mac and get downloads of youtube videos directly to your iPhone or iPad when you use the trial.
…You can always share the love by spreading the word out via Twitter, Facebook and of course, YouTube :D
This happens because you probably have iTunes Wi-fi sync enabled and 'Automatically sync with iTunes' enabled inside iTunes itself.
It's just that if you have 'music & videos synced' then all content transferred with any third party app will be removed – this is the logic of general iTunes sync – it overrides everything. To avoid this, please enable the checkbox: 'manage music and videos manually'.
In the iOS 10.2 update all the videos you download with Softorino YouTube Converter go to the ‘Home Videos’ section inside the TV.app (for now TV.app is only available in North America). There 2 ways you can remove them:
First Option:

Second Option (if you have many files to remove):
You can also hit "edit" at the top right corner to make it even easier.

Coming soon...
If you have difficulties with the app and still can't find the answer here, you can always get in touch with us via e-mail: support@softorino.com