This topic was already published a long time ago from what I saw, but it doesn’t show a clear ending. The implementation of assets in the “Asset Market” present within Gdevelop would be nice, where users can publish content for others (Music, assets, tiles, etc.) whether it is a freemium or premium option. The implementation of this market will help users to efficiently search for “objects”.
I’m happy to report that the newest version basically accomodates this. Please review the current update log, Release 5.0.136 · 4ian/GDevelop · GitHub
There are options for publishing “for cost” assets as of this new update.
Please note that the asset library/store is not intended to be, and should not be viewed as, the only/primary way to use assets in the engine. Ensure you understand how to create objects from scratch, import sound/music/etc, as that will always be an important part of Game Dev.