How to add images to flask website? With database or file name? Python

I'm working on this project of movie database, I made database of the movie details(Name, Rating... etc) But now I need to save the Image in somewhere I saved it in a folder but if the user is not a developer how can he access the folder? Or is there any way for me to save the Images on a database? Flask uses SQLAlchemy and you can't save images in it and if you can it's not that good. If my question is not clear please let me know.