IPFS send "discoverable files"?

Hi,

I followed this Command-line | IPFS Docs

when I do ipfs --version ==>> ipfs version 0.9.1

I can open files ipfs cat /ipfs/QmQPeNsJPyVWPFDVHb77w8G42Fvo15z4bG2X8D2GhfbSXc/readme

I added a file ipfs add somefile.txt => added Hash…

but when In brave or from an other location I do ipfs:// that given hash, I cannot get it.

Why and how to fix this ?