All Australian airlines required their Cabin Crew to have a current Senior First Aid certificate and also a current CPR certificate (if the first year of their Senior First Aid has already elapsed).
After recruitment recurrent training is done before the expiry of these (CPR 1 year, SFA 3 years).
Also as part of initial cabin crew training "Aviation First Aid" is a CASA requirement to be completed (along with many other modules that are mandated by CASA) which goes through aviation specific conditions and treatments.
Initial training of course covers all equipment carried on board including portable oxygen, first aid kits (there are 3 different types of first aid kits at the airline I work at - at least one of each type is carried on every aircraft), UTHs and of course all other aircraft and emergency equipment.