A Proxy is considered valid provided it is signed and dated, and given to the Secretary of the Executive Committee at or before the General Meeting, or a minimum 24 hours before that Meeting in the case of a “large strata scheme” (i.e. >100 Lots).
So by default, the Secretary holds all Proxies.
A Poll Vote may be requested by any Proprietor at the Meeting, and as this changes the vote counting mechanism not the Motion itself, the elections made by Proprietors submitting Proxies in advance of the Meeting still stand for those Motions.