Multidoc allows multiple PDF documents to be sent for signing simultaneously. But keep in mind that all files sent via Signhost must be signed.
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One way to include an attachment is to merge it with the document to be signed (max. size 25 MB);
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Another way is to send the signing link yourself by choosing for signing on premise and add the attachment to your own e-mail.
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Using this method, however, you must also send any reminders yourself.