The maximum MB size of your file you can upload depends on the plan you currently are subscribed to.

FREE
A free plan can upload and convert files up to 25mb in size.  

BASIC
A Basic plan can upload and convert files up to 25mb in size.

PLUS
A Plus plan can upload and convert files up to 100mb in size.

PRO
A Pro plan can upload and convert files up to 250mb in size. If you require a larger file size, we can make arrangements to support up to 2gb.

You can,  however, start with one file and once it's been converted into a simplebooklet, upload a second file from the PAGE CONTENT tab under PAGES > INSERT PDF

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