5.0 lollipop - WhatsApp DONT prompt to RESTORE from local storage, against what WhatsApp FAQ says in its website

I ran into this weird situation, where :

1. I backed up my Whatsapp to local storage, inside : Databases Folder


2. Then I changed my Whatsapp Number ( To another New SIM )


3. Format my HTC Phone ( HTC E9 plus Dual Sim ).



4. Copy back all Whatsapp Folder back to : Internal Storage


5. Re-install Whatsapp, but, all it asks me is this (below) & upon SKIP, nothing, no chat restored. I have already renamed database file, as per Restoring your chat history to msgstore.db.crypt12 & also, I keep same file, with name : msgstore.db.crypt. But, it simply, doesnt even DETECT it & asks NOTHING as BACKUP found / Restore. Any Guess / Idea ? Please help.