Group folder for external upload

Hi

Not used much of Nextcloud so my apologies if I’m asking something that should be basic.

We have a team which requires an external supplier to send them periodic updates for a database.
I was hoping it would be possible to set up a group which the users in this team can be added into, then the external supplier can be sent a link to upload documents into this group folder which any of the internal team can then access to download the required files.
If its possible to set up an email notification for when a file has been dropped into the shared folder that would also be handy.

So is this possible? Is there a document I have missed which tells me how to do this? or does anyone have a steep by step using large pictures and colourful crayons to explain?

Any help greatly appreciated

Cheers

Chris