>Dropbox: from their website...
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>Beginning March 15, 2017, the Public folder will be converted into a standard Dropbox folder that’s private to your account. This transition will occur automatically. After the transition, when someone visits an existing Public folder link, they’ll see an error page.
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>Does anyone have any recommendations on what to use to share files when Dropbox stops this capability?

I am using "Google Drive" (besides dropbox, apple cloud drive and oneDrive) and I like it most.

You can also specify what kind of share you want (i.e.: you can share a document and allow them to edit).