No, most were not 'let in'. There is way more film showing where they overpowered the police and broke in.
Yes they were "let in". They had plenty of intelligence prior. The FBI was an active part of it (you know 'infiltrating'), yet Pelosi refused Trumps pleas for Nation Guard presence.
Why do think Pelosi did not want to allow witnesses at the SHAM2 Imp? Because she would be called to testify, exposing her calculated non-response.
There is more video available they are hiding.
How many insurrection charges have there been so far?