Just for the record, if I enter on my game's "Edit page" I can see this message in the uploads section. Obv this is up to the hosts to decide but right now even if we wanted we cannot upload a new build. We could change the builds within the submission but only those that were uploaded before the voting period started:
Uploads are temporarily disabled because voting for Backtrace GameJam #3 - Win $2500! is in progress. You'll be able to make changes after the jam is over.
** Edited to add the message in writing since the screenshot is just not showing somehow xD **