Deploying useless website for free preferably

Noob here. I built a simple picture sharing app using NodeJS and MongoDb Atlas and now I want to deploy it as a learning experience. The issue is that I store my image files locally in my NodeJS project because I dont think I can store image files in MongoDb atlas and other cloud providers such as S3 are all paid. I thought about hosting it locally but apparently I need a local IP address that my provider is charging 35$/month for. I hosted my frontend on render but they dont seem to allow me to host an API with file storage.

Is there any free way to deploy my website? I dont need much storage as I just want to be able to showcase it.