Resilio Sync it’s a very good alternative to Dropbox or OneDrive, by allowing to share an unlimited amount of files, with any size.
It’s perfect for sharing photos of an event, because it allows you to choose a “read only mode”, so, there’s no risk that someone could delete public files or other.
How does it work? Who starts sharing sends a code like F1C85025ED5843DEA2B428B54A5B9992, which must be imported by who wants to gets the files.
I made a video to show where to insert the code: