If you have received financial aid at a past college, then transfer schools and apply for financial aid at the new school, will the new college request financial aid transcripts from all schools attended (even if you don’t post those schools on your FAFSA)?
What are you talking about? Your financial aid from school A for one year will not be sent to school B in subsequent years…if that is what you are asking.
However, your eligibility limits for federally funded need based aid does not reset when you switch schools.
In addition, if you did not meet SAP at school A, that might be noted someplace.
For federal aid, Pell grants, federal loans etc., there is a database that keeps track of how much of federal aid you’ve received in the past. They don’t need any kind of transcript from you. I’m sure it’s the same with any state aid you may have received. For institutional aid from the schools that’s independent by school.