Wool would have been winched up for storage through these doors. It’s a bit difficult to see the winch since it’s not there anymore. However, there’s a socket for the winch above the top door (and where else would it have been…). The winch would have been a wooden beam with a simple pulley by the looks of other examples in the neighbourhood.
In Port Adelaide, this wool store is one of many, none of which serves its original purpose these days. As far as I could see anyway.
My contribution to Norm’s Thursday Doors.