I did send the documents to them and this has been 3 weeks I got no decision yet

I appreciate your answer, if I send the original documents, how long after that they will make decision ?#

Greetings, I need you guys advise. I applied for naturalization in 20 Dec 2020, and got letter said below paragraph: It is normal letter or not, anyone got same type of letter???????????? I scan these documents and upload online when I applied for the UK Citizenship =================================...