Shopify Token Gate

I’m setting up Shopify Merch Bridge. I have a couple of questions. I would like to use 1155, but it seems very restrictive.

I would like to be able to gift people an NFT from this edition, and have them pick up the merch, but it seems like once the snapshot is taken, I can’t add any more gifts after without making a new token gate. Is this correct? Just want to make sure making a new token gate is the workaround.

Second, how much time between the snapshot and the campaign start time is needed for it to work. I have 420 of the 1155 token in my wallet, it took the snapshot at 1:40 and campaign started at 1:45. Still it said no tokens in wallet.