Access Control settings determines which user had the rights to read, change or change access rights for Documents (Folders and Files) and Issues (Issue board level).
ACL works as follows when it comes to final result for a users access:
1: If you are admin, you have full access
2: If there is set an ACL on your user directly, that rule will apply, regardgless of other permissions from teams/others/owners
3: The rule that will give you the highest permission, gained from either team, others or owners will apply