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The 100MB is perpetual - that is your disk-space - regardless of any integrated file storage locations.
You can delete submissions to conserve space - but do this carefully - making sure you have a copy of what you are deleting.
I will maintain that its important to keep a backup of your files - so upgrading is the better option - it gives you 10GB upwards.
Let us know if this helps.
Oh - and yes - the disk space is shared by all upload forms.