Sending attachments in email from sandbox app

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I have build an application which uses the email widget tot sent mail with a PDF as attachment to a list of mail adresses, In local deployment this works but when I deploy the application to the sandbox the mail is sent but without the attachment. Does anyone know what the reason can be?
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1 answers
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Perhaps a too straight forward soluation, but did you upload the PDF in the Sandbox as well? The Sandbox uses his own database.

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