Syncler does not provide any sources/access to any content. Regardless of if you have Syncler+ or not. However you can access various content by installing provider packages.
Provider package(s) are simple add-ons that allow users to stream audio/video content inside Syncler.
Users may either install package(s) developed by 3rd party developers or develop their own.
Provider packages are developed by independent 3rd party developers.
You as a user are solely responsible for the packages you install and content you consume.
Therefore please ensure proper care when installing 3rd party provider package(s).
Syncler does not come with any provider packages. Provider packages are developed by 3rd party developers. You may search the internet with "Syncler provider package" keyword to find packages. You may also join various communities on the web (i.e reddit, twitter, telegram, discord) tagged with providers4syncler to find packages.
Syncler only shows you source your installed provider packages deliver to Syncler. Please contact the developer(s) of the provider package(s) if it's not working as intended.
That said, there's still a couple of steps you can take to ensure that everything is working smoothly.
If none of these resolved your issue, please reach out to the provider package developer/community directly for further guidance.
You may generate a provisioned custom installer that other users can use to autmatically install provider packages after the app installation using a provision-script.