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With free plan you get 100MB of free space Heather.
This is not per month, but in total, meaning that any time you get over the limit of 100MB your account gets disabled until you either upgrade or free up some space.
What this means is that it is possible for you to receive well over 100MB on your forms as long as you log into your account and free up the space every once and a while, making sure that you are under the limit.
Do let us know if you happen to have any further questions and we would be happy to assist with the same :)