Creating an online level browser for user submitted levels

The game I've been developing for the past 3 years has a level editor which allows user created levels to be shared between players. I'm close to a point where I'm considering early access (open alpha) and I need to start thinking about how are people actually going to share their levels.

As of right now, it's super easy to export the level code with a few clicks, shared on a website like pastebin and imported by copy/pasting it inside the editor. That's fine and I'm willing to use this method for now (I mean look a Path of Exile for example, 50% of this game is played outside of the client [joking of course]), but I kind of want to make this process more integrated into the game itself. The game is not locked to a specific platform or launcher so it needs to have its own way of handling this logic.

These are challenges I see:

• User authentication (for submissions)
• Level code and metadata storage
• Level approval and status
• Level rating and stats
• Level filtering (browse and search)

And with that in mind these are the possible scenarios I see:

• Integrate everything in-game, submission, searching, voting, etc.
• Move submission to an online platform outside of the game while having the searching and voting in-game
• Moving everything to an online platform including submission, searching and voting.
• Forget about everything and have manual sharing between users (as it is right now) while select few levels can be featured directly in-game and updated regularly with new ones.

As a front-end developer with limited back-end knowledge I know how this could work and might even be able to code the app myself with some outside (stackoverflow) help.

Having in mind everything I mentioned above, do you think this is even worth doing? Should I instead opt for the more manual approach, like people sharing levels to me directly and if they are fun enough I can feature them in-game?

If I go down the automated path do you have any ideas/technology that I might not be aware of that could make this whole process easier? Maybe a third-party solution that can handle authentication, submissions and storage?

I believe Google Play Services is locked to Android isn't it?

However FireBase seems like exactly what I was thinking and it might just work. The amount of data I need to store and transfer is so miniscule it probably would fall under their free plan unless there are a lot of active users which doesn't seem too pricy even at scale.

Thank you for that, I'll look into it!