Sharepoint Document Permissions - Open to all

Hello,

I have sharepoint site from a private MS Teams.

In in it, I have a document library that has read/edit permissions for different folders/documents. 

I'd like to set up one folder whose content can be read by any visitor for this sharepoint site. 

I went into Manage Access / Advanced / Stop Inheriting User Permissions / Grant Permissions and I added "<MS Teams/Sharepoint Site name> visitors".

Yet, my visitors still can't access the documents and need to request unique access.

Is there a way of making this folder permission free / accessible by all please?

Thank you!